forked from Minki/linux
318af7b80b
Use of the new -flive-patching flag was introduced with the following commit:43bd3a95c9("kbuild: use -flive-patching when CONFIG_LIVEPATCH is enabled") This flag has several drawbacks: - It disables some optimizations, so it can have a negative effect on performance. - According to the GCC documentation it's not compatible with LTO, which will become a compatibility issue as LTO support gets upstreamed in the kernel. - It was intended to be used for source-based patch generation tooling, as opposed to binary-based patch generation tooling (e.g., kpatch-build). It probably should have at least been behind a separate config option so as not to negatively affect other livepatch users. - Clang doesn't have the flag, so as far as I can tell, this method of generating patches is incompatible with Clang, which like LTO is becoming more mainstream. - It breaks GCC's implicit noreturn detection for local functions. This is the cause of several "unreachable instruction" objtool warnings. - The broken noreturn detection is an obvious GCC regression, but we haven't yet gotten GCC developers to acknowledge that, which doesn't inspire confidence in their willingness to keep the feature working as optimizations are added or changed going forward. - While there *is* a distro which relies on this flag for their distro livepatch module builds, there's not a publicly documented way to create safe livepatch modules with it. Its use seems to be based on tribal knowledge. It serves no benefit to those who don't know how to use it. (In fact, I believe the current livepatch documentation and samples are misleading and dangerous, and should be corrected. Or at least amended with a disclaimer. But I don't feel qualified to make such changes.) Also, we have an idea for using objtool to detect function changes, which could potentially obsolete the need for this flag anyway. At this point the flag has no benefits for upstream which would counteract the above drawbacks. Revert it until it becomes more ready. This reverts commit43bd3a95c9. Fixes:43bd3a95c9("kbuild: use -flive-patching when CONFIG_LIVEPATCH is enabled") Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/696262e997359666afa053fe7d1a9fb2bb373964.1595010490.git.jpoimboe@redhat.com
1904 lines
61 KiB
Makefile
1904 lines
61 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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VERSION = 5
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PATCHLEVEL = 8
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SUBLEVEL = 0
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EXTRAVERSION =
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NAME = Kleptomaniac Octopus
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# *DOCUMENTATION*
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# To see a list of typical targets execute "make help"
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# More info can be located in ./README
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# Comments in this file are targeted only to the developer, do not
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# expect to learn how to build the kernel reading this file.
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$(if $(filter __%, $(MAKECMDGOALS)), \
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$(error targets prefixed with '__' are only for internal use))
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# That's our default target when none is given on the command line
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PHONY := __all
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__all:
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# We are using a recursive build, so we need to do a little thinking
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# to get the ordering right.
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#
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# Most importantly: sub-Makefiles should only ever modify files in
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# their own directory. If in some directory we have a dependency on
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# a file in another dir (which doesn't happen often, but it's often
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# unavoidable when linking the built-in.a targets which finally
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# turn into vmlinux), we will call a sub make in that other dir, and
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# after that we are sure that everything which is in that other dir
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# is now up to date.
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#
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# The only cases where we need to modify files which have global
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# effects are thus separated out and done before the recursive
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# descending is started. They are now explicitly listed as the
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# prepare rule.
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ifneq ($(sub_make_done),1)
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# Do not use make's built-in rules and variables
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# (this increases performance and avoids hard-to-debug behaviour)
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MAKEFLAGS += -rR
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# Avoid funny character set dependencies
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unexport LC_ALL
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LC_COLLATE=C
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LC_NUMERIC=C
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export LC_COLLATE LC_NUMERIC
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# Avoid interference with shell env settings
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unexport GREP_OPTIONS
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# Beautify output
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# ---------------------------------------------------------------------------
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#
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# Normally, we echo the whole command before executing it. By making
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# that echo $($(quiet)$(cmd)), we now have the possibility to set
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# $(quiet) to choose other forms of output instead, e.g.
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#
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# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
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# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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#
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# If $(quiet) is empty, the whole command will be printed.
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# If it is set to "quiet_", only the short version will be printed.
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# If it is set to "silent_", nothing will be printed at all, since
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# the variable $(silent_cmd_cc_o_c) doesn't exist.
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#
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# A simple variant is to prefix commands with $(Q) - that's useful
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# for commands that shall be hidden in non-verbose mode.
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#
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# $(Q)ln $@ :<
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#
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# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
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# If KBUILD_VERBOSE equals 1 then the above command is displayed.
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# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
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#
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# To put more focus on warnings, be less verbose as default
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# Use 'make V=1' to see the full commands
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ifeq ("$(origin V)", "command line")
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KBUILD_VERBOSE = $(V)
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endif
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ifndef KBUILD_VERBOSE
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KBUILD_VERBOSE = 0
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endif
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ifeq ($(KBUILD_VERBOSE),1)
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quiet =
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Q =
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else
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quiet=quiet_
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Q = @
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endif
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# If the user is running make -s (silent mode), suppress echoing of
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# commands
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ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
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quiet=silent_
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endif
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export quiet Q KBUILD_VERBOSE
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# Kbuild will save output files in the current working directory.
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# This does not need to match to the root of the kernel source tree.
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#
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# For example, you can do this:
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#
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# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
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#
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# If you want to save output files in a different location, there are
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# two syntaxes to specify it.
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#
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# 1) O=
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# Use "make O=dir/to/store/output/files/"
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#
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# 2) Set KBUILD_OUTPUT
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# Set the environment variable KBUILD_OUTPUT to point to the output directory.
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# export KBUILD_OUTPUT=dir/to/store/output/files/; make
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#
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# The O= assignment takes precedence over the KBUILD_OUTPUT environment
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# variable.
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# Do we want to change the working directory?
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ifeq ("$(origin O)", "command line")
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KBUILD_OUTPUT := $(O)
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endif
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ifneq ($(KBUILD_OUTPUT),)
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# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
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# expand a shell special character '~'. We use a somewhat tedious way here.
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abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
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$(if $(abs_objtree),, \
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$(error failed to create output directory "$(KBUILD_OUTPUT)"))
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# $(realpath ...) resolves symlinks
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abs_objtree := $(realpath $(abs_objtree))
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else
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abs_objtree := $(CURDIR)
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endif # ifneq ($(KBUILD_OUTPUT),)
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ifeq ($(abs_objtree),$(CURDIR))
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# Suppress "Entering directory ..." unless we are changing the work directory.
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MAKEFLAGS += --no-print-directory
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else
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need-sub-make := 1
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endif
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abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
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ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
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$(error source directory cannot contain spaces or colons)
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endif
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ifneq ($(abs_srctree),$(abs_objtree))
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# Look for make include files relative to root of kernel src
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#
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# This does not become effective immediately because MAKEFLAGS is re-parsed
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# once after the Makefile is read. We need to invoke sub-make.
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MAKEFLAGS += --include-dir=$(abs_srctree)
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need-sub-make := 1
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endif
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this-makefile := $(lastword $(MAKEFILE_LIST))
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ifneq ($(filter 3.%,$(MAKE_VERSION)),)
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# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
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# We need to invoke sub-make to avoid implicit rules in the top Makefile.
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need-sub-make := 1
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# Cancel implicit rules for this Makefile.
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$(this-makefile): ;
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endif
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export abs_srctree abs_objtree
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export sub_make_done := 1
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ifeq ($(need-sub-make),1)
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PHONY += $(MAKECMDGOALS) __sub-make
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$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
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@:
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# Invoke a second make in the output directory, passing relevant variables
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__sub-make:
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$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
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endif # need-sub-make
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endif # sub_make_done
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# We process the rest of the Makefile if this is the final invocation of make
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ifeq ($(need-sub-make),)
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# Do not print "Entering directory ...",
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# but we want to display it when entering to the output directory
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# so that IDEs/editors are able to understand relative filenames.
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MAKEFLAGS += --no-print-directory
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# Call a source code checker (by default, "sparse") as part of the
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# C compilation.
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#
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# Use 'make C=1' to enable checking of only re-compiled files.
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# Use 'make C=2' to enable checking of *all* source files, regardless
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# of whether they are re-compiled or not.
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#
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# See the file "Documentation/dev-tools/sparse.rst" for more details,
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# including where to get the "sparse" utility.
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ifeq ("$(origin C)", "command line")
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KBUILD_CHECKSRC = $(C)
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endif
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ifndef KBUILD_CHECKSRC
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KBUILD_CHECKSRC = 0
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endif
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# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
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# directory of external module to build. Setting M= takes precedence.
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ifeq ("$(origin M)", "command line")
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KBUILD_EXTMOD := $(M)
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endif
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$(if $(word 2, $(KBUILD_EXTMOD)), \
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$(error building multiple external modules is not supported))
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export KBUILD_CHECKSRC KBUILD_EXTMOD
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extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
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ifeq ($(abs_srctree),$(abs_objtree))
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# building in the source tree
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srctree := .
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building_out_of_srctree :=
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else
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ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
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# building in a subdirectory of the source tree
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srctree := ..
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else
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srctree := $(abs_srctree)
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endif
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building_out_of_srctree := 1
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endif
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ifneq ($(KBUILD_ABS_SRCTREE),)
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srctree := $(abs_srctree)
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endif
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objtree := .
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VPATH := $(srctree)
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export building_out_of_srctree srctree objtree VPATH
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# To make sure we do not include .config for any of the *config targets
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# catch them early, and hand them over to scripts/kconfig/Makefile
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# It is allowed to specify more targets when calling make, including
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# mixing *config targets and build targets.
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# For example 'make oldconfig all'.
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# Detect when mixed targets is specified, and make a second invocation
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# of make so .config is not included in this case either (for *config).
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version_h := include/generated/uapi/linux/version.h
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old_version_h := include/linux/version.h
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clean-targets := %clean mrproper cleandocs
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no-dot-config-targets := $(clean-targets) \
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cscope gtags TAGS tags help% %docs check% coccicheck \
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$(version_h) headers headers_% archheaders archscripts \
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%asm-generic kernelversion %src-pkg dt_binding_check \
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outputmakefile
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no-sync-config-targets := $(no-dot-config-targets) install %install \
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kernelrelease
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single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
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config-build :=
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mixed-build :=
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need-config := 1
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may-sync-config := 1
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single-build :=
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ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
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ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
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need-config :=
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endif
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endif
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ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
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ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
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may-sync-config :=
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endif
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endif
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ifneq ($(KBUILD_EXTMOD),)
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may-sync-config :=
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endif
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ifeq ($(KBUILD_EXTMOD),)
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ifneq ($(filter config %config,$(MAKECMDGOALS)),)
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config-build := 1
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ifneq ($(words $(MAKECMDGOALS)),1)
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mixed-build := 1
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endif
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endif
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endif
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# We cannot build single targets and the others at the same time
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ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
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single-build := 1
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ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
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mixed-build := 1
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endif
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endif
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# For "make -j clean all", "make -j mrproper defconfig all", etc.
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ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
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ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
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mixed-build := 1
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endif
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endif
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# install and modules_install need also be processed one by one
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ifneq ($(filter install,$(MAKECMDGOALS)),)
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ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
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mixed-build := 1
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endif
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endif
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ifdef mixed-build
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# ===========================================================================
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# We're called with mixed targets (*config and build targets).
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# Handle them one by one.
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PHONY += $(MAKECMDGOALS) __build_one_by_one
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$(MAKECMDGOALS): __build_one_by_one
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@:
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__build_one_by_one:
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$(Q)set -e; \
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for i in $(MAKECMDGOALS); do \
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$(MAKE) -f $(srctree)/Makefile $$i; \
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done
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else # !mixed-build
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include scripts/Kbuild.include
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# Read KERNELRELEASE from include/config/kernel.release (if it exists)
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KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
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KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
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export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
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include scripts/subarch.include
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# Cross compiling and selecting different set of gcc/bin-utils
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# ---------------------------------------------------------------------------
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#
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# When performing cross compilation for other architectures ARCH shall be set
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# to the target architecture. (See arch/* for the possibilities).
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# ARCH can be set during invocation of make:
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# make ARCH=ia64
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# Another way is to have ARCH set in the environment.
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# The default ARCH is the host where make is executed.
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# CROSS_COMPILE specify the prefix used for all executables used
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# during compilation. Only gcc and related bin-utils executables
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# are prefixed with $(CROSS_COMPILE).
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# CROSS_COMPILE can be set on the command line
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# make CROSS_COMPILE=ia64-linux-
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# Alternatively CROSS_COMPILE can be set in the environment.
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# Default value for CROSS_COMPILE is not to prefix executables
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# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
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ARCH ?= $(SUBARCH)
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# Architecture as present in compile.h
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UTS_MACHINE := $(ARCH)
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SRCARCH := $(ARCH)
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# Additional ARCH settings for x86
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ifeq ($(ARCH),i386)
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SRCARCH := x86
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endif
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ifeq ($(ARCH),x86_64)
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SRCARCH := x86
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endif
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# Additional ARCH settings for sparc
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ifeq ($(ARCH),sparc32)
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SRCARCH := sparc
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endif
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ifeq ($(ARCH),sparc64)
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SRCARCH := sparc
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endif
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# Additional ARCH settings for sh
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ifeq ($(ARCH),sh64)
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SRCARCH := sh
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endif
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KCONFIG_CONFIG ?= .config
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export KCONFIG_CONFIG
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# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
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export KBUILD_DEFCONFIG := defconfig
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# SHELL used by kbuild
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CONFIG_SHELL := sh
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HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
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HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
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HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
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ifneq ($(LLVM),)
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HOSTCC = clang
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HOSTCXX = clang++
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else
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HOSTCC = gcc
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HOSTCXX = g++
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endif
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export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
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-O2 -fomit-frame-pointer -std=gnu89
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export KBUILD_USERLDFLAGS :=
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KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
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KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
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KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
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KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
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|
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# Make variables (CC, etc...)
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CPP = $(CC) -E
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ifneq ($(LLVM),)
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CC = clang
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LD = ld.lld
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|
AR = llvm-ar
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|
NM = llvm-nm
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|
OBJCOPY = llvm-objcopy
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|
OBJDUMP = llvm-objdump
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READELF = llvm-readelf
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|
OBJSIZE = llvm-size
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STRIP = llvm-strip
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else
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|
CC = $(CROSS_COMPILE)gcc
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|
LD = $(CROSS_COMPILE)ld
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|
AR = $(CROSS_COMPILE)ar
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|
NM = $(CROSS_COMPILE)nm
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|
OBJCOPY = $(CROSS_COMPILE)objcopy
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OBJDUMP = $(CROSS_COMPILE)objdump
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|
READELF = $(CROSS_COMPILE)readelf
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OBJSIZE = $(CROSS_COMPILE)size
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STRIP = $(CROSS_COMPILE)strip
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endif
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PAHOLE = pahole
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|
RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
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|
LEX = flex
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|
YACC = bison
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|
AWK = awk
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|
INSTALLKERNEL := installkernel
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|
DEPMOD = /sbin/depmod
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|
PERL = perl
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|
PYTHON = python
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|
PYTHON3 = python3
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|
CHECK = sparse
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|
BASH = bash
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|
KGZIP = gzip
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|
KBZIP2 = bzip2
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|
KLZOP = lzop
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|
LZMA = lzma
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|
LZ4 = lz4c
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|
XZ = xz
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|
ZSTD = zstd
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|
|
|
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
|
|
-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
|
|
NOSTDINC_FLAGS :=
|
|
CFLAGS_MODULE =
|
|
AFLAGS_MODULE =
|
|
LDFLAGS_MODULE =
|
|
CFLAGS_KERNEL =
|
|
AFLAGS_KERNEL =
|
|
LDFLAGS_vmlinux =
|
|
|
|
# Use USERINCLUDE when you must reference the UAPI directories only.
|
|
USERINCLUDE := \
|
|
-I$(srctree)/arch/$(SRCARCH)/include/uapi \
|
|
-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
|
|
-I$(srctree)/include/uapi \
|
|
-I$(objtree)/include/generated/uapi \
|
|
-include $(srctree)/include/linux/kconfig.h
|
|
|
|
# Use LINUXINCLUDE when you must reference the include/ directory.
|
|
# Needed to be compatible with the O= option
|
|
LINUXINCLUDE := \
|
|
-I$(srctree)/arch/$(SRCARCH)/include \
|
|
-I$(objtree)/arch/$(SRCARCH)/include/generated \
|
|
$(if $(building_out_of_srctree),-I$(srctree)/include) \
|
|
-I$(objtree)/include \
|
|
$(USERINCLUDE)
|
|
|
|
KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
|
|
KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
|
|
-fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
|
|
-Werror=implicit-function-declaration -Werror=implicit-int \
|
|
-Wno-format-security \
|
|
-std=gnu89
|
|
KBUILD_CPPFLAGS := -D__KERNEL__
|
|
KBUILD_AFLAGS_KERNEL :=
|
|
KBUILD_CFLAGS_KERNEL :=
|
|
KBUILD_AFLAGS_MODULE := -DMODULE
|
|
KBUILD_CFLAGS_MODULE := -DMODULE
|
|
KBUILD_LDFLAGS_MODULE :=
|
|
export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
|
|
KBUILD_LDFLAGS :=
|
|
GCC_PLUGINS_CFLAGS :=
|
|
CLANG_FLAGS :=
|
|
|
|
export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
|
|
export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
|
|
export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
|
|
export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
|
|
export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
|
|
|
|
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
|
|
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
|
|
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN CFLAGS_KCSAN
|
|
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
|
|
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
|
|
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
|
|
|
|
# Files to ignore in find ... statements
|
|
|
|
export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
|
|
-name CVS -o -name .pc -o -name .hg -o -name .git \) \
|
|
-prune -o
|
|
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
|
|
--exclude CVS --exclude .pc --exclude .hg --exclude .git
|
|
|
|
# ===========================================================================
|
|
# Rules shared between *config targets and build targets
|
|
|
|
# Basic helpers built in scripts/basic/
|
|
PHONY += scripts_basic
|
|
scripts_basic:
|
|
$(Q)$(MAKE) $(build)=scripts/basic
|
|
$(Q)rm -f .tmp_quiet_recordmcount
|
|
|
|
PHONY += outputmakefile
|
|
# Before starting out-of-tree build, make sure the source tree is clean.
|
|
# outputmakefile generates a Makefile in the output directory, if using a
|
|
# separate output directory. This allows convenient use of make in the
|
|
# output directory.
|
|
# At the same time when output Makefile generated, generate .gitignore to
|
|
# ignore whole output directory
|
|
outputmakefile:
|
|
ifdef building_out_of_srctree
|
|
$(Q)if [ -f $(srctree)/.config -o \
|
|
-d $(srctree)/include/config -o \
|
|
-d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
|
|
echo >&2 "***"; \
|
|
echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
|
|
echo >&2 "*** in $(abs_srctree)";\
|
|
echo >&2 "***"; \
|
|
false; \
|
|
fi
|
|
$(Q)ln -fsn $(srctree) source
|
|
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
|
|
$(Q)test -e .gitignore || \
|
|
{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
|
|
endif
|
|
|
|
ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
|
|
ifneq ($(CROSS_COMPILE),)
|
|
CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
|
|
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
|
|
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
|
|
GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
|
|
endif
|
|
ifneq ($(GCC_TOOLCHAIN),)
|
|
CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
|
|
endif
|
|
ifneq ($(LLVM_IAS),1)
|
|
CLANG_FLAGS += -no-integrated-as
|
|
endif
|
|
CLANG_FLAGS += -Werror=unknown-warning-option
|
|
KBUILD_CFLAGS += $(CLANG_FLAGS)
|
|
KBUILD_AFLAGS += $(CLANG_FLAGS)
|
|
export CLANG_FLAGS
|
|
endif
|
|
|
|
# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
|
|
# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
|
|
# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
|
|
# and from include/config/auto.conf.cmd to detect the compiler upgrade.
|
|
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
|
|
|
|
ifdef config-build
|
|
# ===========================================================================
|
|
# *config targets only - make sure prerequisites are updated, and descend
|
|
# in scripts/kconfig to make the *config target
|
|
|
|
# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
|
|
# KBUILD_DEFCONFIG may point out an alternative default configuration
|
|
# used for 'make defconfig'
|
|
include arch/$(SRCARCH)/Makefile
|
|
export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
|
|
|
|
config: outputmakefile scripts_basic FORCE
|
|
$(Q)$(MAKE) $(build)=scripts/kconfig $@
|
|
|
|
%config: outputmakefile scripts_basic FORCE
|
|
$(Q)$(MAKE) $(build)=scripts/kconfig $@
|
|
|
|
else #!config-build
|
|
# ===========================================================================
|
|
# Build targets only - this includes vmlinux, arch specific targets, clean
|
|
# targets and others. In general all targets except *config targets.
|
|
|
|
# If building an external module we do not care about the all: rule
|
|
# but instead __all depend on modules
|
|
PHONY += all
|
|
ifeq ($(KBUILD_EXTMOD),)
|
|
__all: all
|
|
else
|
|
__all: modules
|
|
endif
|
|
|
|
# Decide whether to build built-in, modular, or both.
|
|
# Normally, just do built-in.
|
|
|
|
KBUILD_MODULES :=
|
|
KBUILD_BUILTIN := 1
|
|
|
|
# If we have only "make modules", don't compile built-in objects.
|
|
ifeq ($(MAKECMDGOALS),modules)
|
|
KBUILD_BUILTIN :=
|
|
endif
|
|
|
|
# If we have "make <whatever> modules", compile modules
|
|
# in addition to whatever we do anyway.
|
|
# Just "make" or "make all" shall build modules as well
|
|
|
|
ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
|
|
KBUILD_MODULES := 1
|
|
endif
|
|
|
|
ifeq ($(MAKECMDGOALS),)
|
|
KBUILD_MODULES := 1
|
|
endif
|
|
|
|
export KBUILD_MODULES KBUILD_BUILTIN
|
|
|
|
ifdef need-config
|
|
include include/config/auto.conf
|
|
endif
|
|
|
|
ifeq ($(KBUILD_EXTMOD),)
|
|
# Objects we will link into vmlinux / subdirs we need to visit
|
|
core-y := init/ usr/
|
|
drivers-y := drivers/ sound/
|
|
drivers-$(CONFIG_SAMPLES) += samples/
|
|
drivers-y += net/ virt/
|
|
libs-y := lib/
|
|
endif # KBUILD_EXTMOD
|
|
|
|
# The all: target is the default when no target is given on the
|
|
# command line.
|
|
# This allow a user to issue only 'make' to build a kernel including modules
|
|
# Defaults to vmlinux, but the arch makefile usually adds further targets
|
|
all: vmlinux
|
|
|
|
CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
|
|
$(call cc-option,-fno-tree-loop-im) \
|
|
$(call cc-disable-warning,maybe-uninitialized,)
|
|
export CFLAGS_GCOV
|
|
|
|
# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
CC_FLAGS_FTRACE := -pg
|
|
endif
|
|
|
|
RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
|
|
RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
|
|
RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
|
|
RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
|
|
RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
|
|
RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
|
|
export RETPOLINE_CFLAGS
|
|
export RETPOLINE_VDSO_CFLAGS
|
|
|
|
include arch/$(SRCARCH)/Makefile
|
|
|
|
ifdef need-config
|
|
ifdef may-sync-config
|
|
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
|
|
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
|
|
# because some architectures define CROSS_COMPILE there.
|
|
include include/config/auto.conf.cmd
|
|
|
|
$(KCONFIG_CONFIG):
|
|
@echo >&2 '***'
|
|
@echo >&2 '*** Configuration file "$@" not found!'
|
|
@echo >&2 '***'
|
|
@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
|
|
@echo >&2 '*** "make menuconfig" or "make xconfig").'
|
|
@echo >&2 '***'
|
|
@/bin/false
|
|
|
|
# The actual configuration files used during the build are stored in
|
|
# include/generated/ and include/config/. Update them if .config is newer than
|
|
# include/config/auto.conf (which mirrors .config).
|
|
#
|
|
# This exploits the 'multi-target pattern rule' trick.
|
|
# The syncconfig should be executed only once to make all the targets.
|
|
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
|
|
%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
|
|
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
|
|
else # !may-sync-config
|
|
# External modules and some install targets need include/generated/autoconf.h
|
|
# and include/config/auto.conf but do not care if they are up-to-date.
|
|
# Use auto.conf to trigger the test
|
|
PHONY += include/config/auto.conf
|
|
|
|
include/config/auto.conf:
|
|
$(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
|
|
echo >&2; \
|
|
echo >&2 " ERROR: Kernel configuration is invalid."; \
|
|
echo >&2 " include/generated/autoconf.h or $@ are missing.";\
|
|
echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
|
|
echo >&2 ; \
|
|
/bin/false)
|
|
|
|
endif # may-sync-config
|
|
endif # need-config
|
|
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
|
|
|
|
ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
|
|
KBUILD_CFLAGS += -O2
|
|
else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
|
|
KBUILD_CFLAGS += -O3
|
|
else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
|
|
KBUILD_CFLAGS += -Os
|
|
endif
|
|
|
|
# Tell gcc to never replace conditional load with a non-conditional one
|
|
KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
|
|
|
|
include scripts/Makefile.kcov
|
|
include scripts/Makefile.gcc-plugins
|
|
|
|
ifdef CONFIG_READABLE_ASM
|
|
# Disable optimizations that make assembler listings hard to read.
|
|
# reorder blocks reorders the control in the function
|
|
# ipa clone creates specialized cloned functions
|
|
# partial inlining inlines only parts of functions
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
|
|
$(call cc-option,-fno-ipa-cp-clone,) \
|
|
$(call cc-option,-fno-partial-inlining)
|
|
endif
|
|
|
|
ifneq ($(CONFIG_FRAME_WARN),0)
|
|
KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
|
|
endif
|
|
|
|
stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
|
|
stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
|
|
stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
|
|
|
|
KBUILD_CFLAGS += $(stackp-flags-y)
|
|
|
|
ifdef CONFIG_CC_IS_CLANG
|
|
KBUILD_CPPFLAGS += -Qunused-arguments
|
|
KBUILD_CFLAGS += -Wno-format-invalid-specifier
|
|
KBUILD_CFLAGS += -Wno-gnu
|
|
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
|
|
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
|
|
# See modpost pattern 2
|
|
KBUILD_CFLAGS += -mno-global-merge
|
|
else
|
|
|
|
# These warnings generated too much noise in a regular build.
|
|
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
|
|
KBUILD_CFLAGS += -Wno-unused-but-set-variable
|
|
|
|
# Warn about unmarked fall-throughs in switch statement.
|
|
# Disabled for clang while comment to attribute conversion happens and
|
|
# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
|
|
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
|
|
endif
|
|
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
|
|
ifdef CONFIG_FRAME_POINTER
|
|
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
|
|
else
|
|
# Some targets (ARM with Thumb2, for example), can't be built with frame
|
|
# pointers. For those, we don't have FUNCTION_TRACER automatically
|
|
# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
|
|
# incompatible with -fomit-frame-pointer with current GCC, so we don't use
|
|
# -fomit-frame-pointer with FUNCTION_TRACER.
|
|
ifndef CONFIG_FUNCTION_TRACER
|
|
KBUILD_CFLAGS += -fomit-frame-pointer
|
|
endif
|
|
endif
|
|
|
|
# Initialize all stack variables with a 0xAA pattern.
|
|
ifdef CONFIG_INIT_STACK_ALL_PATTERN
|
|
KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
|
|
endif
|
|
|
|
# Initialize all stack variables with a zero value.
|
|
ifdef CONFIG_INIT_STACK_ALL_ZERO
|
|
# Future support for zero initialization is still being debated, see
|
|
# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
|
|
# renamed or dropped.
|
|
KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
|
|
KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
|
|
endif
|
|
|
|
DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
|
|
|
|
ifdef CONFIG_DEBUG_INFO
|
|
ifdef CONFIG_DEBUG_INFO_SPLIT
|
|
DEBUG_CFLAGS += -gsplit-dwarf
|
|
else
|
|
DEBUG_CFLAGS += -g
|
|
endif
|
|
KBUILD_AFLAGS += -Wa,-gdwarf-2
|
|
endif
|
|
ifdef CONFIG_DEBUG_INFO_DWARF4
|
|
DEBUG_CFLAGS += -gdwarf-4
|
|
endif
|
|
|
|
ifdef CONFIG_DEBUG_INFO_REDUCED
|
|
DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
|
|
$(call cc-option,-fno-var-tracking)
|
|
endif
|
|
|
|
ifdef CONFIG_DEBUG_INFO_COMPRESSED
|
|
DEBUG_CFLAGS += -gz=zlib
|
|
KBUILD_AFLAGS += -gz=zlib
|
|
KBUILD_LDFLAGS += --compress-debug-sections=zlib
|
|
endif
|
|
|
|
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
|
|
export DEBUG_CFLAGS
|
|
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
|
# gcc 5 supports generating the mcount tables directly
|
|
ifeq ($(call cc-option-yn,-mrecord-mcount),y)
|
|
CC_FLAGS_FTRACE += -mrecord-mcount
|
|
export CC_USING_RECORD_MCOUNT := 1
|
|
endif
|
|
ifdef CONFIG_HAVE_NOP_MCOUNT
|
|
ifeq ($(call cc-option-yn, -mnop-mcount),y)
|
|
CC_FLAGS_FTRACE += -mnop-mcount
|
|
CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
|
|
endif
|
|
endif
|
|
endif
|
|
ifdef CONFIG_HAVE_FENTRY
|
|
ifeq ($(call cc-option-yn, -mfentry),y)
|
|
CC_FLAGS_FTRACE += -mfentry
|
|
CC_FLAGS_USING += -DCC_USING_FENTRY
|
|
endif
|
|
endif
|
|
export CC_FLAGS_FTRACE
|
|
KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
|
|
KBUILD_AFLAGS += $(CC_FLAGS_USING)
|
|
ifdef CONFIG_DYNAMIC_FTRACE
|
|
ifdef CONFIG_HAVE_C_RECORDMCOUNT
|
|
BUILD_C_RECORDMCOUNT := y
|
|
export BUILD_C_RECORDMCOUNT
|
|
endif
|
|
endif
|
|
endif
|
|
|
|
# We trigger additional mismatches with less inlining
|
|
ifdef CONFIG_DEBUG_SECTION_MISMATCH
|
|
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
|
|
endif
|
|
|
|
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
|
|
KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
|
|
LDFLAGS_vmlinux += --gc-sections
|
|
endif
|
|
|
|
ifdef CONFIG_SHADOW_CALL_STACK
|
|
CC_FLAGS_SCS := -fsanitize=shadow-call-stack
|
|
KBUILD_CFLAGS += $(CC_FLAGS_SCS)
|
|
export CC_FLAGS_SCS
|
|
endif
|
|
|
|
# arch Makefile may override CC so keep this after arch Makefile is included
|
|
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
|
|
|
|
# warn about C99 declaration after statement
|
|
KBUILD_CFLAGS += -Wdeclaration-after-statement
|
|
|
|
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
|
|
KBUILD_CFLAGS += -Wvla
|
|
|
|
# disable pointer signed / unsigned warnings in gcc 4.0
|
|
KBUILD_CFLAGS += -Wno-pointer-sign
|
|
|
|
# disable stringop warnings in gcc 8+
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
|
|
|
|
# We'll want to enable this eventually, but it's not going away for 5.7 at least
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
|
|
|
|
# Another good warning that we'll want to enable eventually
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
|
|
|
|
# Enabled with W=2, disabled by default as noisy
|
|
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
|
|
|
|
# disable invalid "can't wrap" optimizations for signed / pointers
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
|
|
|
|
# clang sets -fmerge-all-constants by default as optimization, but this
|
|
# is non-conforming behavior for C and in fact breaks the kernel, so we
|
|
# need to disable it here generally.
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
|
|
|
|
# for gcc -fno-merge-all-constants disables everything, but it is fine
|
|
# to have actual conforming behavior enabled.
|
|
KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
|
|
|
|
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
|
|
KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
|
|
|
|
# conserve stack if available
|
|
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
|
|
|
|
# Prohibit date/time macros, which would make the build non-deterministic
|
|
KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
|
|
|
|
# enforce correct pointer usage
|
|
KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
|
|
|
|
# Require designated initializers for all marked structures
|
|
KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
|
|
|
|
# change __FILE__ to the relative path from the srctree
|
|
KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
|
|
|
|
# ensure -fcf-protection is disabled when using retpoline as it is
|
|
# incompatible with -mindirect-branch=thunk-extern
|
|
ifdef CONFIG_RETPOLINE
|
|
KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
|
|
endif
|
|
|
|
include scripts/Makefile.kasan
|
|
include scripts/Makefile.extrawarn
|
|
include scripts/Makefile.ubsan
|
|
include scripts/Makefile.kcsan
|
|
|
|
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
|
|
KBUILD_CPPFLAGS += $(KCPPFLAGS)
|
|
KBUILD_AFLAGS += $(KAFLAGS)
|
|
KBUILD_CFLAGS += $(KCFLAGS)
|
|
|
|
KBUILD_LDFLAGS_MODULE += --build-id
|
|
LDFLAGS_vmlinux += --build-id
|
|
|
|
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
|
|
LDFLAGS_vmlinux += $(call ld-option, -X,)
|
|
endif
|
|
|
|
ifeq ($(CONFIG_RELR),y)
|
|
LDFLAGS_vmlinux += --pack-dyn-relocs=relr
|
|
endif
|
|
|
|
# Align the bit size of userspace programs with the kernel
|
|
KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
|
|
KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
|
|
|
|
# make the checker run with the right architecture
|
|
CHECKFLAGS += --arch=$(ARCH)
|
|
|
|
# insure the checker run with the right endianness
|
|
CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
|
|
|
|
# the checker needs the correct machine size
|
|
CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
|
|
|
|
# Default kernel image to build when no specific target is given.
|
|
# KBUILD_IMAGE may be overruled on the command line or
|
|
# set in the environment
|
|
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
|
|
# this default value
|
|
export KBUILD_IMAGE ?= vmlinux
|
|
|
|
#
|
|
# INSTALL_PATH specifies where to place the updated kernel and system map
|
|
# images. Default is /boot, but you can set it to other values
|
|
export INSTALL_PATH ?= /boot
|
|
|
|
#
|
|
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
|
|
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
|
|
# an argument if needed. Otherwise it defaults to the kernel install path
|
|
#
|
|
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
|
|
|
|
#
|
|
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
|
|
# relocations required by build roots. This is not defined in the
|
|
# makefile but the argument can be passed to make if needed.
|
|
#
|
|
|
|
MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
|
|
export MODLIB
|
|
|
|
#
|
|
# INSTALL_MOD_STRIP, if defined, will cause modules to be
|
|
# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
|
|
# the default option --strip-debug will be used. Otherwise,
|
|
# INSTALL_MOD_STRIP value will be used as the options to the strip command.
|
|
|
|
ifdef INSTALL_MOD_STRIP
|
|
ifeq ($(INSTALL_MOD_STRIP),1)
|
|
mod_strip_cmd = $(STRIP) --strip-debug
|
|
else
|
|
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
|
|
endif # INSTALL_MOD_STRIP=1
|
|
else
|
|
mod_strip_cmd = true
|
|
endif # INSTALL_MOD_STRIP
|
|
export mod_strip_cmd
|
|
|
|
# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
|
|
# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
|
|
# or CONFIG_MODULE_COMPRESS_XZ.
|
|
|
|
mod_compress_cmd = true
|
|
ifdef CONFIG_MODULE_COMPRESS
|
|
ifdef CONFIG_MODULE_COMPRESS_GZIP
|
|
mod_compress_cmd = $(KGZIP) -n -f
|
|
endif # CONFIG_MODULE_COMPRESS_GZIP
|
|
ifdef CONFIG_MODULE_COMPRESS_XZ
|
|
mod_compress_cmd = $(XZ) -f
|
|
endif # CONFIG_MODULE_COMPRESS_XZ
|
|
endif # CONFIG_MODULE_COMPRESS
|
|
export mod_compress_cmd
|
|
|
|
ifdef CONFIG_MODULE_SIG_ALL
|
|
$(eval $(call config_filename,MODULE_SIG_KEY))
|
|
|
|
mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
|
|
else
|
|
mod_sign_cmd = true
|
|
endif
|
|
export mod_sign_cmd
|
|
|
|
HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
|
|
|
|
has_libelf = $(call try-run,\
|
|
echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
|
|
|
|
ifdef CONFIG_STACK_VALIDATION
|
|
ifeq ($(has_libelf),1)
|
|
objtool_target := tools/objtool FORCE
|
|
else
|
|
SKIP_STACK_VALIDATION := 1
|
|
export SKIP_STACK_VALIDATION
|
|
endif
|
|
endif
|
|
|
|
ifdef CONFIG_DEBUG_INFO_BTF
|
|
ifeq ($(has_libelf),1)
|
|
resolve_btfids_target := tools/bpf/resolve_btfids FORCE
|
|
else
|
|
ERROR_RESOLVE_BTFIDS := 1
|
|
endif
|
|
endif
|
|
|
|
PHONY += prepare0
|
|
|
|
export MODORDER := $(extmod-prefix)modules.order
|
|
export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
|
|
|
|
ifeq ($(KBUILD_EXTMOD),)
|
|
core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
|
|
|
|
vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
|
|
$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
|
|
$(libs-y) $(libs-m)))
|
|
|
|
vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
|
|
$(patsubst %/,%,$(filter %/, $(core-) \
|
|
$(drivers-) $(libs-))))
|
|
|
|
subdir-modorder := $(addsuffix modules.order,$(filter %/, \
|
|
$(core-y) $(core-m) $(libs-y) $(libs-m) \
|
|
$(drivers-y) $(drivers-m)))
|
|
|
|
build-dirs := $(vmlinux-dirs)
|
|
clean-dirs := $(vmlinux-alldirs)
|
|
|
|
# Externally visible symbols (used by link-vmlinux.sh)
|
|
KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
|
|
KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
|
|
ifdef CONFIG_MODULES
|
|
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
|
|
KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
|
|
else
|
|
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
|
|
endif
|
|
KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
|
|
|
|
export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
|
|
export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
|
|
export LDFLAGS_vmlinux
|
|
# used by scripts/Makefile.package
|
|
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
|
|
|
|
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
|
|
|
|
# Recurse until adjust_autoksyms.sh is satisfied
|
|
PHONY += autoksyms_recursive
|
|
ifdef CONFIG_TRIM_UNUSED_KSYMS
|
|
# For the kernel to actually contain only the needed exported symbols,
|
|
# we have to build modules as well to determine what those symbols are.
|
|
# (this can be evaluated only once include/config/auto.conf has been included)
|
|
KBUILD_MODULES := 1
|
|
|
|
autoksyms_recursive: descend modules.order
|
|
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
|
|
"$(MAKE) -f $(srctree)/Makefile vmlinux"
|
|
endif
|
|
|
|
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
|
|
|
|
quiet_cmd_autoksyms_h = GEN $@
|
|
cmd_autoksyms_h = mkdir -p $(dir $@); \
|
|
$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
|
|
|
|
$(autoksyms_h):
|
|
$(call cmd,autoksyms_h)
|
|
|
|
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
|
|
|
|
# Final link of vmlinux with optional arch pass after final link
|
|
cmd_link-vmlinux = \
|
|
$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
|
|
$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
|
|
|
|
vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
|
|
+$(call if_changed,link-vmlinux)
|
|
|
|
targets := vmlinux
|
|
|
|
# The actual objects are generated when descending,
|
|
# make sure no implicit rule kicks in
|
|
$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
|
|
|
|
filechk_kernel.release = \
|
|
echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
|
|
|
|
# Store (new) KERNELRELEASE string in include/config/kernel.release
|
|
include/config/kernel.release: FORCE
|
|
$(call filechk,kernel.release)
|
|
|
|
# Additional helpers built in scripts/
|
|
# Carefully list dependencies so we do not try to build scripts twice
|
|
# in parallel
|
|
PHONY += scripts
|
|
scripts: scripts_basic scripts_dtc
|
|
$(Q)$(MAKE) $(build)=$(@)
|
|
|
|
# Things we need to do before we recursively start building the kernel
|
|
# or the modules are listed in "prepare".
|
|
# A multi level approach is used. prepareN is processed before prepareN-1.
|
|
# archprepare is used in arch Makefiles and when processed asm symlink,
|
|
# version.h and scripts_basic is processed / created.
|
|
|
|
PHONY += prepare archprepare
|
|
|
|
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
|
|
asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
|
|
include/generated/autoconf.h
|
|
|
|
prepare0: archprepare
|
|
$(Q)$(MAKE) $(build)=scripts/mod
|
|
$(Q)$(MAKE) $(build)=.
|
|
|
|
# All the preparing..
|
|
prepare: prepare0 prepare-objtool prepare-resolve_btfids
|
|
|
|
# Support for using generic headers in asm-generic
|
|
asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
|
|
|
|
PHONY += asm-generic uapi-asm-generic
|
|
asm-generic: uapi-asm-generic
|
|
$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
|
|
generic=include/asm-generic
|
|
uapi-asm-generic:
|
|
$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
|
|
generic=include/uapi/asm-generic
|
|
|
|
PHONY += prepare-objtool prepare-resolve_btfids
|
|
prepare-objtool: $(objtool_target)
|
|
ifeq ($(SKIP_STACK_VALIDATION),1)
|
|
ifdef CONFIG_UNWINDER_ORC
|
|
@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
|
|
@false
|
|
else
|
|
@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
|
|
endif
|
|
endif
|
|
|
|
prepare-resolve_btfids: $(resolve_btfids_target)
|
|
ifeq ($(ERROR_RESOLVE_BTFIDS),1)
|
|
@echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
|
|
@false
|
|
endif
|
|
# Generate some files
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# KERNELRELEASE can change from a few different places, meaning version.h
|
|
# needs to be updated, so this check is forced on all builds
|
|
|
|
uts_len := 64
|
|
define filechk_utsrelease.h
|
|
if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
|
|
echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
|
|
exit 1; \
|
|
fi; \
|
|
echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
|
|
endef
|
|
|
|
define filechk_version.h
|
|
echo \#define LINUX_VERSION_CODE $(shell \
|
|
expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
|
|
echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
|
|
endef
|
|
|
|
$(version_h): FORCE
|
|
$(call filechk,version.h)
|
|
$(Q)rm -f $(old_version_h)
|
|
|
|
include/generated/utsrelease.h: include/config/kernel.release FORCE
|
|
$(call filechk,utsrelease.h)
|
|
|
|
PHONY += headerdep
|
|
headerdep:
|
|
$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
|
|
$(srctree)/scripts/headerdep.pl -I$(srctree)/include
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Kernel headers
|
|
|
|
#Default location for installed headers
|
|
export INSTALL_HDR_PATH = $(objtree)/usr
|
|
|
|
quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
|
|
cmd_headers_install = \
|
|
mkdir -p $(INSTALL_HDR_PATH); \
|
|
rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
|
|
usr/include $(INSTALL_HDR_PATH)
|
|
|
|
PHONY += headers_install
|
|
headers_install: headers
|
|
$(call cmd,headers_install)
|
|
|
|
PHONY += archheaders archscripts
|
|
|
|
hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
|
|
|
|
PHONY += headers
|
|
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
|
|
$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
|
|
$(error Headers not exportable for the $(SRCARCH) architecture))
|
|
$(Q)$(MAKE) $(hdr-inst)=include/uapi
|
|
$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
|
|
|
|
# Deprecated. It is no-op now.
|
|
PHONY += headers_check
|
|
headers_check:
|
|
@:
|
|
|
|
ifdef CONFIG_HEADERS_INSTALL
|
|
prepare: headers
|
|
endif
|
|
|
|
PHONY += scripts_unifdef
|
|
scripts_unifdef: scripts_basic
|
|
$(Q)$(MAKE) $(build)=scripts scripts/unifdef
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Kernel selftest
|
|
|
|
PHONY += kselftest
|
|
kselftest:
|
|
$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
|
|
|
|
kselftest-%: FORCE
|
|
$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
|
|
|
|
PHONY += kselftest-merge
|
|
kselftest-merge:
|
|
$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
|
|
$(Q)find $(srctree)/tools/testing/selftests -name config | \
|
|
xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
|
|
$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Devicetree files
|
|
|
|
ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
|
|
dtstree := arch/$(SRCARCH)/boot/dts
|
|
endif
|
|
|
|
ifneq ($(dtstree),)
|
|
|
|
%.dtb: include/config/kernel.release scripts_dtc
|
|
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
|
|
|
|
PHONY += dtbs dtbs_install dtbs_check
|
|
dtbs: include/config/kernel.release scripts_dtc
|
|
$(Q)$(MAKE) $(build)=$(dtstree)
|
|
|
|
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
|
|
export CHECK_DTBS=y
|
|
dtbs: dt_binding_check
|
|
endif
|
|
|
|
dtbs_check: dtbs
|
|
|
|
dtbs_install:
|
|
$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
|
|
|
|
ifdef CONFIG_OF_EARLY_FLATTREE
|
|
all: dtbs
|
|
endif
|
|
|
|
endif
|
|
|
|
PHONY += scripts_dtc
|
|
scripts_dtc: scripts_basic
|
|
$(Q)$(MAKE) $(build)=scripts/dtc
|
|
|
|
ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
|
|
export CHECK_DT_BINDING=y
|
|
endif
|
|
|
|
PHONY += dt_binding_check
|
|
dt_binding_check: scripts_dtc
|
|
$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
|
|
|
|
# ---------------------------------------------------------------------------
|
|
# Modules
|
|
|
|
ifdef CONFIG_MODULES
|
|
|
|
# By default, build modules as well
|
|
|
|
all: modules
|
|
|
|
# When we're building modules with modversions, we need to consider
|
|
# the built-in objects during the descend as well, in order to
|
|
# make sure the checksums are up to date before we record them.
|
|
ifdef CONFIG_MODVERSIONS
|
|
KBUILD_BUILTIN := 1
|
|
endif
|
|
|
|
# Build modules
|
|
#
|
|
# A module can be listed more than once in obj-m resulting in
|
|
# duplicate lines in modules.order files. Those are removed
|
|
# using awk while concatenating to the final file.
|
|
|
|
PHONY += modules
|
|
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
|
|
|
|
PHONY += modules_check
|
|
modules_check: modules.order
|
|
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
|
|
|
|
cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
|
|
|
|
modules.order: $(subdir-modorder) FORCE
|
|
$(call if_changed,modules_order)
|
|
|
|
targets += modules.order
|
|
|
|
# Target to prepare building external modules
|
|
PHONY += modules_prepare
|
|
modules_prepare: prepare
|
|
|
|
# Target to install modules
|
|
PHONY += modules_install
|
|
modules_install: _modinst_ _modinst_post
|
|
|
|
PHONY += _modinst_
|
|
_modinst_:
|
|
@rm -rf $(MODLIB)/kernel
|
|
@rm -f $(MODLIB)/source
|
|
@mkdir -p $(MODLIB)/kernel
|
|
@ln -s $(abspath $(srctree)) $(MODLIB)/source
|
|
@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
|
|
rm -f $(MODLIB)/build ; \
|
|
ln -s $(CURDIR) $(MODLIB)/build ; \
|
|
fi
|
|
@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
|
|
@cp -f modules.builtin $(MODLIB)/
|
|
@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
|
|
|
|
# This depmod is only for convenience to give the initial
|
|
# boot a modules.dep even before / is mounted read-write. However the
|
|
# boot script depmod is the master version.
|
|
PHONY += _modinst_post
|
|
_modinst_post: _modinst_
|
|
$(call cmd,depmod)
|
|
|
|
ifeq ($(CONFIG_MODULE_SIG), y)
|
|
PHONY += modules_sign
|
|
modules_sign:
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
|
|
endif
|
|
|
|
else # CONFIG_MODULES
|
|
|
|
# Modules not configured
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += modules modules_install
|
|
modules modules_install:
|
|
@echo >&2
|
|
@echo >&2 "The present kernel configuration has modules disabled."
|
|
@echo >&2 "Type 'make config' and enable loadable module support."
|
|
@echo >&2 "Then build a kernel with module support enabled."
|
|
@echo >&2
|
|
@exit 1
|
|
|
|
endif # CONFIG_MODULES
|
|
|
|
###
|
|
# Cleaning is done on three levels.
|
|
# make clean Delete most generated files
|
|
# Leave enough to build external modules
|
|
# make mrproper Delete the current configuration, and all generated files
|
|
# make distclean Remove editor backup files, patch leftover files and the like
|
|
|
|
# Directories & files removed with 'make clean'
|
|
CLEAN_FILES += include/ksym vmlinux.symvers \
|
|
modules.builtin modules.builtin.modinfo modules.nsdeps
|
|
|
|
# Directories & files removed with 'make mrproper'
|
|
MRPROPER_FILES += include/config include/generated \
|
|
arch/$(SRCARCH)/include/generated .tmp_objdiff \
|
|
debian snap tar-install \
|
|
.config .config.old .version \
|
|
Module.symvers \
|
|
signing_key.pem signing_key.priv signing_key.x509 \
|
|
x509.genkey extra_certificates signing_key.x509.keyid \
|
|
signing_key.x509.signer vmlinux-gdb.py \
|
|
*.spec
|
|
|
|
# Directories & files removed with 'make distclean'
|
|
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
|
|
|
|
# clean - Delete most, but leave enough to build external modules
|
|
#
|
|
clean: rm-files := $(CLEAN_FILES)
|
|
|
|
PHONY += archclean vmlinuxclean
|
|
|
|
vmlinuxclean:
|
|
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
|
|
$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
|
|
|
|
clean: archclean vmlinuxclean
|
|
|
|
# mrproper - Delete all generated files, including .config
|
|
#
|
|
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
|
|
mrproper-dirs := $(addprefix _mrproper_,scripts)
|
|
|
|
PHONY += $(mrproper-dirs) mrproper
|
|
$(mrproper-dirs):
|
|
$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
|
|
|
|
mrproper: clean $(mrproper-dirs)
|
|
$(call cmd,rmfiles)
|
|
|
|
# distclean
|
|
#
|
|
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
|
|
|
|
PHONY += distclean
|
|
|
|
distclean: mrproper
|
|
$(call cmd,rmfiles)
|
|
@find $(srctree) $(RCS_FIND_IGNORE) \
|
|
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
|
|
-o -name '*.bak' -o -name '#*#' -o -name '*%' \
|
|
-o -name 'core' \) \
|
|
-type f -print | xargs rm -f
|
|
|
|
|
|
# Packaging of the kernel to various formats
|
|
# ---------------------------------------------------------------------------
|
|
|
|
%src-pkg: FORCE
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
|
|
%pkg: include/config/kernel.release FORCE
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
|
|
|
|
# Brief documentation of the typical targets used
|
|
# ---------------------------------------------------------------------------
|
|
|
|
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
|
|
boards := $(sort $(notdir $(boards)))
|
|
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
|
|
board-dirs := $(sort $(notdir $(board-dirs:/=)))
|
|
|
|
PHONY += help
|
|
help:
|
|
@echo 'Cleaning targets:'
|
|
@echo ' clean - Remove most generated files but keep the config and'
|
|
@echo ' enough build support to build external modules'
|
|
@echo ' mrproper - Remove all generated files + config + various backup files'
|
|
@echo ' distclean - mrproper + remove editor backup and patch files'
|
|
@echo ''
|
|
@echo 'Configuration targets:'
|
|
@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
|
|
@echo ''
|
|
@echo 'Other generic targets:'
|
|
@echo ' all - Build all targets marked with [*]'
|
|
@echo '* vmlinux - Build the bare kernel'
|
|
@echo '* modules - Build all modules'
|
|
@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
|
|
@echo ' dir/ - Build all files in dir and below'
|
|
@echo ' dir/file.[ois] - Build specified target only'
|
|
@echo ' dir/file.ll - Build the LLVM assembly file'
|
|
@echo ' (requires compiler support for LLVM assembly generation)'
|
|
@echo ' dir/file.lst - Build specified mixed source/assembly target only'
|
|
@echo ' (requires a recent binutils and recent build (System.map))'
|
|
@echo ' dir/file.ko - Build module including final link'
|
|
@echo ' modules_prepare - Set up for building external modules'
|
|
@echo ' tags/TAGS - Generate tags file for editors'
|
|
@echo ' cscope - Generate cscope index'
|
|
@echo ' gtags - Generate GNU GLOBAL index'
|
|
@echo ' kernelrelease - Output the release version string (use with make -s)'
|
|
@echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
|
|
@echo ' image_name - Output the image name (use with make -s)'
|
|
@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
|
|
echo ' (default: $(INSTALL_HDR_PATH))'; \
|
|
echo ''
|
|
@echo 'Static analysers:'
|
|
@echo ' checkstack - Generate a list of stack hogs'
|
|
@echo ' namespacecheck - Name space analysis on compiled kernel'
|
|
@echo ' versioncheck - Sanity check on version.h usage'
|
|
@echo ' includecheck - Check for duplicate included header files'
|
|
@echo ' export_report - List the usages of all exported symbols'
|
|
@echo ' headerdep - Detect inclusion cycles in headers'
|
|
@echo ' coccicheck - Check with Coccinelle'
|
|
@echo ''
|
|
@echo 'Tools:'
|
|
@echo ' nsdeps - Generate missing symbol namespace dependencies'
|
|
@echo ''
|
|
@echo 'Kernel selftest:'
|
|
@echo ' kselftest - Build and run kernel selftest'
|
|
@echo ' Build, install, and boot kernel before'
|
|
@echo ' running kselftest on it'
|
|
@echo ' Run as root for full coverage'
|
|
@echo ' kselftest-all - Build kernel selftest'
|
|
@echo ' kselftest-install - Build and install kernel selftest'
|
|
@echo ' kselftest-clean - Remove all generated kselftest files'
|
|
@echo ' kselftest-merge - Merge all the config dependencies of'
|
|
@echo ' kselftest to existing .config.'
|
|
@echo ''
|
|
@$(if $(dtstree), \
|
|
echo 'Devicetree:'; \
|
|
echo '* dtbs - Build device tree blobs for enabled boards'; \
|
|
echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
|
|
echo ' dt_binding_check - Validate device tree binding documents'; \
|
|
echo ' dtbs_check - Validate device tree source files';\
|
|
echo '')
|
|
|
|
@echo 'Userspace tools targets:'
|
|
@echo ' use "make tools/help"'
|
|
@echo ' or "cd tools; make help"'
|
|
@echo ''
|
|
@echo 'Kernel packaging:'
|
|
@$(MAKE) -f $(srctree)/scripts/Makefile.package help
|
|
@echo ''
|
|
@echo 'Documentation targets:'
|
|
@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
|
|
@echo ''
|
|
@echo 'Architecture specific targets ($(SRCARCH)):'
|
|
@$(if $(archhelp),$(archhelp),\
|
|
echo ' No architecture specific help defined for $(SRCARCH)')
|
|
@echo ''
|
|
@$(if $(boards), \
|
|
$(foreach b, $(boards), \
|
|
printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
|
|
echo '')
|
|
@$(if $(board-dirs), \
|
|
$(foreach b, $(board-dirs), \
|
|
printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
|
|
printf " %-16s - Show all of the above\\n" help-boards; \
|
|
echo '')
|
|
|
|
@echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
|
|
@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
|
|
@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
|
|
@echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
|
|
@echo ' (sparse by default)'
|
|
@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
|
|
@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
|
|
@echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
|
|
@echo ' 1: warnings which may be relevant and do not occur too often'
|
|
@echo ' 2: warnings which occur quite often but may still be relevant'
|
|
@echo ' 3: more obscure warnings, can most likely be ignored'
|
|
@echo ' Multiple levels can be combined with W=12 or W=123'
|
|
@echo ''
|
|
@echo 'Execute "make" or "make all" to build all targets marked with [*] '
|
|
@echo 'For further info see the ./README file'
|
|
|
|
|
|
help-board-dirs := $(addprefix help-,$(board-dirs))
|
|
|
|
help-boards: $(help-board-dirs)
|
|
|
|
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
|
|
|
|
$(help-board-dirs): help-%:
|
|
@echo 'Architecture specific targets ($(SRCARCH) $*):'
|
|
@$(if $(boards-per-dir), \
|
|
$(foreach b, $(boards-per-dir), \
|
|
printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
|
|
echo '')
|
|
|
|
|
|
# Documentation targets
|
|
# ---------------------------------------------------------------------------
|
|
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
|
|
linkcheckdocs dochelp refcheckdocs
|
|
PHONY += $(DOC_TARGETS)
|
|
$(DOC_TARGETS):
|
|
$(Q)$(MAKE) $(build)=Documentation $@
|
|
|
|
# Misc
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += scripts_gdb
|
|
scripts_gdb: prepare0
|
|
$(Q)$(MAKE) $(build)=scripts/gdb
|
|
$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
|
|
|
|
ifdef CONFIG_GDB_SCRIPTS
|
|
all: scripts_gdb
|
|
endif
|
|
|
|
else # KBUILD_EXTMOD
|
|
|
|
###
|
|
# External module support.
|
|
# When building external modules the kernel used as basis is considered
|
|
# read-only, and no consistency checks are made and the make
|
|
# system is not used on the basis kernel. If updates are required
|
|
# in the basis kernel ordinary make commands (without M=...) must
|
|
# be used.
|
|
#
|
|
# The following are the only valid targets when building external
|
|
# modules.
|
|
# make M=dir clean Delete all automatically generated files
|
|
# make M=dir modules Make all modules in specified dir
|
|
# make M=dir Same as 'make M=dir modules'
|
|
# make M=dir modules_install
|
|
# Install the modules built in the module directory
|
|
# Assumes install directory is already created
|
|
|
|
# We are always building modules
|
|
KBUILD_MODULES := 1
|
|
|
|
build-dirs := $(KBUILD_EXTMOD)
|
|
PHONY += modules
|
|
modules: descend
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
|
|
|
|
PHONY += modules_install
|
|
modules_install: _emodinst_ _emodinst_post
|
|
|
|
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
|
|
PHONY += _emodinst_
|
|
_emodinst_:
|
|
$(Q)mkdir -p $(MODLIB)/$(install-dir)
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
|
|
|
|
PHONY += _emodinst_post
|
|
_emodinst_post: _emodinst_
|
|
$(call cmd,depmod)
|
|
|
|
clean-dirs := $(KBUILD_EXTMOD)
|
|
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
|
|
|
|
PHONY += help
|
|
help:
|
|
@echo ' Building external modules.'
|
|
@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
|
|
@echo ''
|
|
@echo ' modules - default target, build the module(s)'
|
|
@echo ' modules_install - install the module'
|
|
@echo ' clean - remove generated files in module directory only'
|
|
@echo ''
|
|
|
|
PHONY += prepare
|
|
endif # KBUILD_EXTMOD
|
|
|
|
# Single targets
|
|
# ---------------------------------------------------------------------------
|
|
# To build individual files in subdirectories, you can do like this:
|
|
#
|
|
# make foo/bar/baz.s
|
|
#
|
|
# The supported suffixes for single-target are listed in 'single-targets'
|
|
#
|
|
# To build only under specific subdirectories, you can do like this:
|
|
#
|
|
# make foo/bar/baz/
|
|
|
|
ifdef single-build
|
|
|
|
# .ko is special because modpost is needed
|
|
single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
|
|
single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
|
|
|
|
$(single-ko): single_modpost
|
|
@:
|
|
$(single-no-ko): descend
|
|
@:
|
|
|
|
ifeq ($(KBUILD_EXTMOD),)
|
|
# For the single build of in-tree modules, use a temporary file to avoid
|
|
# the situation of modules_install installing an invalid modules.order.
|
|
MODORDER := .modules.tmp
|
|
endif
|
|
|
|
PHONY += single_modpost
|
|
single_modpost: $(single-no-ko)
|
|
$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
|
|
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
|
|
|
|
KBUILD_MODULES := 1
|
|
|
|
export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
|
|
|
|
# trim unrelated directories
|
|
build-dirs := $(foreach d, $(build-dirs), \
|
|
$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
|
|
|
|
endif
|
|
|
|
ifndef CONFIG_MODULES
|
|
KBUILD_MODULES :=
|
|
endif
|
|
|
|
# Handle descending into subdirectories listed in $(build-dirs)
|
|
# Preset locale variables to speed up the build process. Limit locale
|
|
# tweaks to this spot to avoid wrong language settings when running
|
|
# make menuconfig etc.
|
|
# Error messages still appears in the original language
|
|
PHONY += descend $(build-dirs)
|
|
descend: $(build-dirs)
|
|
$(build-dirs): prepare
|
|
$(Q)$(MAKE) $(build)=$@ \
|
|
single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
|
|
need-builtin=1 need-modorder=1
|
|
|
|
clean-dirs := $(addprefix _clean_, $(clean-dirs))
|
|
PHONY += $(clean-dirs) clean
|
|
$(clean-dirs):
|
|
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
|
|
|
|
clean: $(clean-dirs)
|
|
$(call cmd,rmfiles)
|
|
@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
|
|
\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
|
|
-o -name '*.ko.*' \
|
|
-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
|
|
-o -name '*.dwo' -o -name '*.lst' \
|
|
-o -name '*.su' -o -name '*.mod' \
|
|
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
|
|
-o -name '*.lex.c' -o -name '*.tab.[ch]' \
|
|
-o -name '*.asn1.[ch]' \
|
|
-o -name '*.symtypes' -o -name 'modules.order' \
|
|
-o -name '.tmp_*.o.*' \
|
|
-o -name '*.c.[012]*.*' \
|
|
-o -name '*.ll' \
|
|
-o -name '*.gcno' \) -type f -print | xargs rm -f
|
|
|
|
# Generate tags for editors
|
|
# ---------------------------------------------------------------------------
|
|
quiet_cmd_tags = GEN $@
|
|
cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
|
|
|
|
tags TAGS cscope gtags: FORCE
|
|
$(call cmd,tags)
|
|
|
|
# Script to generate missing namespace dependencies
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += nsdeps
|
|
nsdeps: export KBUILD_NSDEPS=1
|
|
nsdeps: modules
|
|
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
|
|
|
|
# Scripts to check various things for consistency
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += includecheck versioncheck coccicheck namespacecheck export_report
|
|
|
|
includecheck:
|
|
find $(srctree)/* $(RCS_FIND_IGNORE) \
|
|
-name '*.[hcS]' -type f -print | sort \
|
|
| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
|
|
|
|
versioncheck:
|
|
find $(srctree)/* $(RCS_FIND_IGNORE) \
|
|
-name '*.[hcS]' -type f -print | sort \
|
|
| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
|
|
|
|
coccicheck:
|
|
$(Q)$(BASH) $(srctree)/scripts/$@
|
|
|
|
namespacecheck:
|
|
$(PERL) $(srctree)/scripts/namespace.pl
|
|
|
|
export_report:
|
|
$(PERL) $(srctree)/scripts/export_report.pl
|
|
|
|
PHONY += checkstack kernelrelease kernelversion image_name
|
|
|
|
# UML needs a little special treatment here. It wants to use the host
|
|
# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
|
|
# else wants $(ARCH), including people doing cross-builds, which means
|
|
# that $(SUBARCH) doesn't work here.
|
|
ifeq ($(ARCH), um)
|
|
CHECKSTACK_ARCH := $(SUBARCH)
|
|
else
|
|
CHECKSTACK_ARCH := $(ARCH)
|
|
endif
|
|
checkstack:
|
|
$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
|
|
$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
|
|
|
|
kernelrelease:
|
|
@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
|
|
|
|
kernelversion:
|
|
@echo $(KERNELVERSION)
|
|
|
|
image_name:
|
|
@echo $(KBUILD_IMAGE)
|
|
|
|
# Clear a bunch of variables before executing the submake
|
|
|
|
ifeq ($(quiet),silent_)
|
|
tools_silent=s
|
|
endif
|
|
|
|
tools/: FORCE
|
|
$(Q)mkdir -p $(objtree)/tools
|
|
$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
|
|
|
|
tools/%: FORCE
|
|
$(Q)mkdir -p $(objtree)/tools
|
|
$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
|
|
|
|
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
|
|
cmd_rmfiles = rm -rf $(rm-files)
|
|
|
|
# Run depmod only if we have System.map and depmod is executable
|
|
quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
|
|
cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
|
|
$(KERNELRELEASE)
|
|
|
|
# read saved command lines for existing targets
|
|
existing-targets := $(wildcard $(sort $(targets)))
|
|
|
|
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
|
|
|
endif # config-build
|
|
endif # mixed-build
|
|
endif # need-sub-make
|
|
|
|
PHONY += FORCE
|
|
FORCE:
|
|
|
|
# Declare the contents of the PHONY variable as phony. We keep that
|
|
# information in a variable so we can use it in if_changed and friends.
|
|
.PHONY: $(PHONY)
|