mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 06:01:57 +00:00
clang-lto series for v5.12-rc1
- Clang LTO build infrastructure and arm64-specific enablement (Sami Tolvanen)
- Recursive build CC_FLAGS_LTO fix (Alexander Lobakin)
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Merge tag 'clang-lto-v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull clang LTO updates from Kees Cook:
"Clang Link Time Optimization.
This is built on the work done preparing for LTO by arm64 folks,
tracing folks, etc. This includes the core changes as well as the
remaining pieces for arm64 (LTO has been the default build method on
Android for about 3 years now, as it is the prerequisite for the
Control Flow Integrity protections).
While x86 LTO enablement is done, it depends on some pending objtool
clean-ups. It's possible that I'll send a "part 2" pull request for
LTO that includes x86 support.
For merge log posterity, and as detailed in commit dc5723b02e
("kbuild: add support for Clang LTO"), here is the lt;dr to do an LTO
build:
make LLVM=1 LLVM_IAS=1 defconfig
scripts/config -e LTO_CLANG_THIN
make LLVM=1 LLVM_IAS=1
(To do a cross-compile of arm64, add "CROSS_COMPILE=aarch64-linux-gnu-"
and "ARCH=arm64" to the "make" command lines.)
Summary:
- Clang LTO build infrastructure and arm64-specific enablement (Sami
Tolvanen)
- Recursive build CC_FLAGS_LTO fix (Alexander Lobakin)"
* tag 'clang-lto-v5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
kbuild: prevent CC_FLAGS_LTO self-bloating on recursive rebuilds
arm64: allow LTO to be selected
arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS
arm64: vdso: disable LTO
drivers/misc/lkdtm: disable LTO for rodata.o
efi/libstub: disable LTO
scripts/mod: disable LTO for empty.c
modpost: lto: strip .lto from module names
PCI: Fix PREL32 relocations for LTO
init: lto: fix PREL32 relocations
init: lto: ensure initcall ordering
kbuild: lto: add a default list of used symbols
kbuild: lto: merge module sections
kbuild: lto: limit inlining
kbuild: lto: fix module versioning
kbuild: add support for Clang LTO
tracing: move function tracer options to Kconfig
This commit is contained in:
Linus Torvalds
commit
79db4d2293
1
.gitignore
vendored
1
.gitignore
vendored
@ -42,6 +42,7 @@
|
||||
*.so.dbg
|
||||
*.su
|
||||
*.symtypes
|
||||
*.symversions
|
||||
*.tab.[ch]
|
||||
*.tar
|
||||
*.xz
|
||||
|
||||
45
Makefile
45
Makefile
@ -853,12 +853,8 @@ KBUILD_CFLAGS += $(DEBUG_CFLAGS)
|
||||
export DEBUG_CFLAGS
|
||||
|
||||
ifdef CONFIG_FUNCTION_TRACER
|
||||
ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
||||
# gcc 5 supports generating the mcount tables directly
|
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ifeq ($(call cc-option-yn,-mrecord-mcount),y)
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CC_FLAGS_FTRACE += -mrecord-mcount
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export CC_USING_RECORD_MCOUNT := 1
|
||||
endif
|
||||
ifdef CONFIG_FTRACE_MCOUNT_USE_CC
|
||||
CC_FLAGS_FTRACE += -mrecord-mcount
|
||||
ifdef CONFIG_HAVE_NOP_MCOUNT
|
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ifeq ($(call cc-option-yn, -mnop-mcount),y)
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CC_FLAGS_FTRACE += -mnop-mcount
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@ -866,6 +862,12 @@ ifdef CONFIG_FTRACE_MCOUNT_RECORD
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endif
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endif
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endif
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ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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ifdef CONFIG_HAVE_C_RECORDMCOUNT
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BUILD_C_RECORDMCOUNT := y
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export BUILD_C_RECORDMCOUNT
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endif
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endif
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ifdef CONFIG_HAVE_FENTRY
|
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ifeq ($(call cc-option-yn, -mfentry),y)
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CC_FLAGS_FTRACE += -mfentry
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@ -875,12 +877,6 @@ endif
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export CC_FLAGS_FTRACE
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KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
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KBUILD_AFLAGS += $(CC_FLAGS_USING)
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ifdef CONFIG_DYNAMIC_FTRACE
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ifdef CONFIG_HAVE_C_RECORDMCOUNT
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BUILD_C_RECORDMCOUNT := y
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export BUILD_C_RECORDMCOUNT
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endif
|
||||
endif
|
||||
endif
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|
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# We trigger additional mismatches with less inlining
|
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@ -899,6 +895,24 @@ KBUILD_CFLAGS += $(CC_FLAGS_SCS)
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export CC_FLAGS_SCS
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endif
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ifdef CONFIG_LTO_CLANG
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ifdef CONFIG_LTO_CLANG_THIN
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CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
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KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod-prefix).thinlto-cache
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else
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CC_FLAGS_LTO := -flto
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endif
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CC_FLAGS_LTO += -fvisibility=hidden
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|
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# Limit inlining across translation units to reduce binary size
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KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
|
||||
endif
|
||||
|
||||
ifdef CONFIG_LTO
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KBUILD_CFLAGS += $(CC_FLAGS_LTO)
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export CC_FLAGS_LTO
|
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endif
|
||||
|
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ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
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KBUILD_CFLAGS += -falign-functions=32
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endif
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@ -1493,7 +1507,7 @@ MRPROPER_FILES += include/config include/generated \
|
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*.spec
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|
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# Directories & files removed with 'make distclean'
|
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DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
|
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DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS .thinlto-cache
|
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|
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# clean - Delete most, but leave enough to build external modules
|
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#
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@ -1739,7 +1753,7 @@ PHONY += compile_commands.json
|
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|
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clean-dirs := $(KBUILD_EXTMOD)
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clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
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$(KBUILD_EXTMOD)/compile_commands.json
|
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$(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
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|
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PHONY += help
|
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help:
|
||||
@ -1836,7 +1850,8 @@ clean: $(clean-dirs)
|
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-o -name '.tmp_*.o.*' \
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||||
-o -name '*.c.[012]*.*' \
|
||||
-o -name '*.ll' \
|
||||
-o -name '*.gcno' \) -type f -print | xargs rm -f
|
||||
-o -name '*.gcno' \
|
||||
-o -name '*.*.symversions' \) -type f -print | xargs rm -f
|
||||
|
||||
# Generate tags for editors
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
90
arch/Kconfig
90
arch/Kconfig
@ -603,6 +603,96 @@ config SHADOW_CALL_STACK
|
||||
reading and writing arbitrary memory may be able to locate them
|
||||
and hijack control flow by modifying the stacks.
|
||||
|
||||
config LTO
|
||||
bool
|
||||
help
|
||||
Selected if the kernel will be built using the compiler's LTO feature.
|
||||
|
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config LTO_CLANG
|
||||
bool
|
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select LTO
|
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help
|
||||
Selected if the kernel will be built using Clang's LTO feature.
|
||||
|
||||
config ARCH_SUPPORTS_LTO_CLANG
|
||||
bool
|
||||
help
|
||||
An architecture should select this option if it supports:
|
||||
- compiling with Clang,
|
||||
- compiling inline assembly with Clang's integrated assembler,
|
||||
- and linking with LLD.
|
||||
|
||||
config ARCH_SUPPORTS_LTO_CLANG_THIN
|
||||
bool
|
||||
help
|
||||
An architecture should select this option if it can support Clang's
|
||||
ThinLTO mode.
|
||||
|
||||
config HAS_LTO_CLANG
|
||||
def_bool y
|
||||
# Clang >= 11: https://github.com/ClangBuiltLinux/linux/issues/510
|
||||
depends on CC_IS_CLANG && CLANG_VERSION >= 110000 && LD_IS_LLD
|
||||
depends on $(success,test $(LLVM) -eq 1)
|
||||
depends on $(success,test $(LLVM_IAS) -eq 1)
|
||||
depends on $(success,$(NM) --help | head -n 1 | grep -qi llvm)
|
||||
depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm)
|
||||
depends on ARCH_SUPPORTS_LTO_CLANG
|
||||
depends on !FTRACE_MCOUNT_USE_RECORDMCOUNT
|
||||
depends on !KASAN
|
||||
depends on !GCOV_KERNEL
|
||||
help
|
||||
The compiler and Kconfig options support building with Clang's
|
||||
LTO.
|
||||
|
||||
choice
|
||||
prompt "Link Time Optimization (LTO)"
|
||||
default LTO_NONE
|
||||
help
|
||||
This option enables Link Time Optimization (LTO), which allows the
|
||||
compiler to optimize binaries globally.
|
||||
|
||||
If unsure, select LTO_NONE. Note that LTO is very resource-intensive
|
||||
so it's disabled by default.
|
||||
|
||||
config LTO_NONE
|
||||
bool "None"
|
||||
help
|
||||
Build the kernel normally, without Link Time Optimization (LTO).
|
||||
|
||||
config LTO_CLANG_FULL
|
||||
bool "Clang Full LTO (EXPERIMENTAL)"
|
||||
depends on HAS_LTO_CLANG
|
||||
depends on !COMPILE_TEST
|
||||
select LTO_CLANG
|
||||
help
|
||||
This option enables Clang's full Link Time Optimization (LTO), which
|
||||
allows the compiler to optimize the kernel globally. If you enable
|
||||
this option, the compiler generates LLVM bitcode instead of ELF
|
||||
object files, and the actual compilation from bitcode happens at
|
||||
the LTO link step, which may take several minutes depending on the
|
||||
kernel configuration. More information can be found from LLVM's
|
||||
documentation:
|
||||
|
||||
https://llvm.org/docs/LinkTimeOptimization.html
|
||||
|
||||
During link time, this option can use a large amount of RAM, and
|
||||
may take much longer than the ThinLTO option.
|
||||
|
||||
config LTO_CLANG_THIN
|
||||
bool "Clang ThinLTO (EXPERIMENTAL)"
|
||||
depends on HAS_LTO_CLANG && ARCH_SUPPORTS_LTO_CLANG_THIN
|
||||
select LTO_CLANG
|
||||
help
|
||||
This option enables Clang's ThinLTO, which allows for parallel
|
||||
optimization and faster incremental compiles compared to the
|
||||
CONFIG_LTO_CLANG_FULL option. More information can be found
|
||||
from Clang's documentation:
|
||||
|
||||
https://clang.llvm.org/docs/ThinLTO.html
|
||||
|
||||
If unsure, say Y.
|
||||
endchoice
|
||||
|
||||
config HAVE_ARCH_WITHIN_STACK_FRAMES
|
||||
bool
|
||||
help
|
||||
|
||||
@ -73,6 +73,8 @@ config ARM64
|
||||
select ARCH_SUPPORTS_DEBUG_PAGEALLOC
|
||||
select ARCH_SUPPORTS_MEMORY_FAILURE
|
||||
select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK
|
||||
select ARCH_SUPPORTS_LTO_CLANG if CPU_LITTLE_ENDIAN
|
||||
select ARCH_SUPPORTS_LTO_CLANG_THIN
|
||||
select ARCH_SUPPORTS_ATOMIC_RMW
|
||||
select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && (GCC_VERSION >= 50000 || CC_IS_CLANG)
|
||||
select ARCH_SUPPORTS_NUMA_BALANCING
|
||||
@ -162,6 +164,8 @@ config ARM64
|
||||
select HAVE_DYNAMIC_FTRACE
|
||||
select HAVE_DYNAMIC_FTRACE_WITH_REGS \
|
||||
if $(cc-option,-fpatchable-function-entry=2)
|
||||
select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \
|
||||
if DYNAMIC_FTRACE_WITH_REGS
|
||||
select HAVE_EFFICIENT_UNALIGNED_ACCESS
|
||||
select HAVE_FAST_GUP
|
||||
select HAVE_FTRACE_MCOUNT_RECORD
|
||||
|
||||
@ -29,7 +29,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
|
||||
ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
|
||||
ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
|
||||
|
||||
CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS)
|
||||
CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \
|
||||
$(CC_FLAGS_LTO)
|
||||
KASAN_SANITIZE := n
|
||||
UBSAN_SANITIZE := n
|
||||
OBJECT_FILES_NON_STANDARD := y
|
||||
|
||||
@ -38,6 +38,8 @@ KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
|
||||
|
||||
# remove SCS flags from all objects in this directory
|
||||
KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
|
||||
# disable LTO
|
||||
KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS))
|
||||
|
||||
GCOV_PROFILE := n
|
||||
# Sanitizer runtimes are unavailable and cannot be linked here.
|
||||
|
||||
@ -16,6 +16,7 @@ lkdtm-$(CONFIG_PPC_BOOK3S_64) += powerpc.o
|
||||
KASAN_SANITIZE_rodata.o := n
|
||||
KASAN_SANITIZE_stackleak.o := n
|
||||
KCOV_INSTRUMENT_rodata.o := n
|
||||
CFLAGS_REMOVE_rodata.o += $(CC_FLAGS_LTO)
|
||||
|
||||
OBJCOPYFLAGS :=
|
||||
OBJCOPYFLAGS_rodata_objcopy.o := \
|
||||
|
||||
@ -90,10 +90,13 @@
|
||||
* .data. We don't want to pull in .data..other sections, which Linux
|
||||
* has defined. Same for text and bss.
|
||||
*
|
||||
* With LTO_CLANG, the linker also splits sections by default, so we need
|
||||
* these macros to combine the sections during the final link.
|
||||
*
|
||||
* RODATA_MAIN is not used because existing code already defines .rodata.x
|
||||
* sections to be brought in with rodata.
|
||||
*/
|
||||
#ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
|
||||
#if defined(CONFIG_LD_DEAD_CODE_DATA_ELIMINATION) || defined(CONFIG_LTO_CLANG)
|
||||
#define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
|
||||
#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_* .data.$Lubsan_*
|
||||
#define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
|
||||
|
||||
@ -184,19 +184,80 @@ extern bool initcall_debug;
|
||||
* as KEEP() in the linker script.
|
||||
*/
|
||||
|
||||
/* Format: <modname>__<counter>_<line>_<fn> */
|
||||
#define __initcall_id(fn) \
|
||||
__PASTE(__KBUILD_MODNAME, \
|
||||
__PASTE(__, \
|
||||
__PASTE(__COUNTER__, \
|
||||
__PASTE(_, \
|
||||
__PASTE(__LINE__, \
|
||||
__PASTE(_, fn))))))
|
||||
|
||||
/* Format: __<prefix>__<iid><id> */
|
||||
#define __initcall_name(prefix, __iid, id) \
|
||||
__PASTE(__, \
|
||||
__PASTE(prefix, \
|
||||
__PASTE(__, \
|
||||
__PASTE(__iid, id))))
|
||||
|
||||
#ifdef CONFIG_LTO_CLANG
|
||||
/*
|
||||
* With LTO, the compiler doesn't necessarily obey link order for
|
||||
* initcalls. In order to preserve the correct order, we add each
|
||||
* variable into its own section and generate a linker script (in
|
||||
* scripts/link-vmlinux.sh) to specify the order of the sections.
|
||||
*/
|
||||
#define __initcall_section(__sec, __iid) \
|
||||
#__sec ".init.." #__iid
|
||||
|
||||
/*
|
||||
* With LTO, the compiler can rename static functions to avoid
|
||||
* global naming collisions. We use a global stub function for
|
||||
* initcalls to create a stable symbol name whose address can be
|
||||
* taken in inline assembly when PREL32 relocations are used.
|
||||
*/
|
||||
#define __initcall_stub(fn, __iid, id) \
|
||||
__initcall_name(initstub, __iid, id)
|
||||
|
||||
#define __define_initcall_stub(__stub, fn) \
|
||||
int __init __stub(void); \
|
||||
int __init __stub(void) \
|
||||
{ \
|
||||
return fn(); \
|
||||
} \
|
||||
__ADDRESSABLE(__stub)
|
||||
#else
|
||||
#define __initcall_section(__sec, __iid) \
|
||||
#__sec ".init"
|
||||
|
||||
#define __initcall_stub(fn, __iid, id) fn
|
||||
|
||||
#define __define_initcall_stub(__stub, fn) \
|
||||
__ADDRESSABLE(fn)
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
|
||||
#define ___define_initcall(fn, id, __sec) \
|
||||
__ADDRESSABLE(fn) \
|
||||
asm(".section \"" #__sec ".init\", \"a\" \n" \
|
||||
"__initcall_" #fn #id ": \n" \
|
||||
".long " #fn " - . \n" \
|
||||
#define ____define_initcall(fn, __stub, __name, __sec) \
|
||||
__define_initcall_stub(__stub, fn) \
|
||||
asm(".section \"" __sec "\", \"a\" \n" \
|
||||
__stringify(__name) ": \n" \
|
||||
".long " __stringify(__stub) " - . \n" \
|
||||
".previous \n");
|
||||
#else
|
||||
#define ___define_initcall(fn, id, __sec) \
|
||||
static initcall_t __initcall_##fn##id __used \
|
||||
__attribute__((__section__(#__sec ".init"))) = fn;
|
||||
#define ____define_initcall(fn, __unused, __name, __sec) \
|
||||
static initcall_t __name __used \
|
||||
__attribute__((__section__(__sec))) = fn;
|
||||
#endif
|
||||
|
||||
#define __unique_initcall(fn, id, __sec, __iid) \
|
||||
____define_initcall(fn, \
|
||||
__initcall_stub(fn, __iid, id), \
|
||||
__initcall_name(initcall, __iid, id), \
|
||||
__initcall_section(__sec, __iid))
|
||||
|
||||
#define ___define_initcall(fn, id, __sec) \
|
||||
__unique_initcall(fn, id, __sec, __initcall_id(fn))
|
||||
|
||||
#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
|
||||
|
||||
/*
|
||||
@ -236,7 +297,7 @@ extern bool initcall_debug;
|
||||
#define __exitcall(fn) \
|
||||
static exitcall_t __exitcall_##fn __exit_call = fn
|
||||
|
||||
#define console_initcall(fn) ___define_initcall(fn,, .con_initcall)
|
||||
#define console_initcall(fn) ___define_initcall(fn, con, .con_initcall)
|
||||
|
||||
struct obs_kernel_param {
|
||||
const char *str;
|
||||
|
||||
@ -1926,7 +1926,7 @@ enum pci_fixup_pass {
|
||||
};
|
||||
|
||||
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
|
||||
#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
#define ___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, hook) \
|
||||
__ADDRESSABLE(hook) \
|
||||
asm(".section " #sec ", \"a\" \n" \
|
||||
@ -1935,10 +1935,33 @@ enum pci_fixup_pass {
|
||||
".long " #class ", " #class_shift " \n" \
|
||||
".long " #hook " - . \n" \
|
||||
".previous \n");
|
||||
|
||||
/*
|
||||
* Clang's LTO may rename static functions in C, but has no way to
|
||||
* handle such renamings when referenced from inline asm. To work
|
||||
* around this, create global C stubs for these cases.
|
||||
*/
|
||||
#ifdef CONFIG_LTO_CLANG
|
||||
#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, hook, stub) \
|
||||
void stub(struct pci_dev *dev); \
|
||||
void stub(struct pci_dev *dev) \
|
||||
{ \
|
||||
hook(dev); \
|
||||
} \
|
||||
___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, stub)
|
||||
#else
|
||||
#define __DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, hook, stub) \
|
||||
___DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, hook)
|
||||
#endif
|
||||
|
||||
#define DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, hook) \
|
||||
__DECLARE_PCI_FIXUP_SECTION(sec, name, vendor, device, class, \
|
||||
class_shift, hook)
|
||||
class_shift, hook, __UNIQUE_ID(hook))
|
||||
#else
|
||||
/* Anonymous variables would be nice... */
|
||||
#define DECLARE_PCI_FIXUP_SECTION(section, name, vendor, device, class, \
|
||||
|
||||
@ -2307,6 +2307,7 @@ config TRIM_UNUSED_KSYMS
|
||||
config UNUSED_KSYMS_WHITELIST
|
||||
string "Whitelist of symbols to keep in ksymtab"
|
||||
depends on TRIM_UNUSED_KSYMS
|
||||
default "scripts/lto-used-symbollist.txt" if LTO_CLANG
|
||||
help
|
||||
By default, all unused exported symbols will be un-exported from the
|
||||
build when TRIM_UNUSED_KSYMS is selected.
|
||||
|
||||
@ -602,6 +602,22 @@ config FTRACE_MCOUNT_RECORD
|
||||
depends on DYNAMIC_FTRACE
|
||||
depends on HAVE_FTRACE_MCOUNT_RECORD
|
||||
|
||||
config FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
|
||||
bool
|
||||
depends on FTRACE_MCOUNT_RECORD
|
||||
|
||||
config FTRACE_MCOUNT_USE_CC
|
||||
def_bool y
|
||||
depends on $(cc-option,-mrecord-mcount)
|
||||
depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
|
||||
depends on FTRACE_MCOUNT_RECORD
|
||||
|
||||
config FTRACE_MCOUNT_USE_RECORDMCOUNT
|
||||
def_bool y
|
||||
depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
|
||||
depends on !FTRACE_MCOUNT_USE_CC
|
||||
depends on FTRACE_MCOUNT_RECORD
|
||||
|
||||
config TRACING_MAP
|
||||
bool
|
||||
depends on ARCH_HAVE_NMI_SAFE_CMPXCHG
|
||||
|
||||
@ -111,7 +111,7 @@ endif
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
|
||||
cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) -fverbose-asm -S -o $@ $<
|
||||
cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
|
||||
|
||||
$(obj)/%.s: $(src)/%.c FORCE
|
||||
$(call if_changed_dep,cc_s_c)
|
||||
@ -166,6 +166,15 @@ ifdef CONFIG_MODVERSIONS
|
||||
# the actual value of the checksum generated by genksyms
|
||||
# o remove .tmp_<file>.o to <file>.o
|
||||
|
||||
ifdef CONFIG_LTO_CLANG
|
||||
# Generate .o.symversions files for each .o with exported symbols, and link these
|
||||
# to the kernel and/or modules at the end.
|
||||
cmd_modversions_c = \
|
||||
if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
|
||||
$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
||||
> $@.symversions; \
|
||||
fi;
|
||||
else
|
||||
cmd_modversions_c = \
|
||||
if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
|
||||
$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
||||
@ -177,9 +186,9 @@ cmd_modversions_c = \
|
||||
rm -f $(@D)/.tmp_$(@F:.o=.ver); \
|
||||
fi
|
||||
endif
|
||||
endif
|
||||
|
||||
ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
||||
ifndef CC_USING_RECORD_MCOUNT
|
||||
ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
||||
# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
|
||||
ifdef BUILD_C_RECORDMCOUNT
|
||||
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
|
||||
@ -206,8 +215,7 @@ recordmcount_source := $(srctree)/scripts/recordmcount.pl
|
||||
endif # BUILD_C_RECORDMCOUNT
|
||||
cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
|
||||
$(sub_cmd_record_mcount))
|
||||
endif # CC_USING_RECORD_MCOUNT
|
||||
endif # CONFIG_FTRACE_MCOUNT_RECORD
|
||||
endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
||||
|
||||
ifdef CONFIG_STACK_VALIDATION
|
||||
ifneq ($(SKIP_STACK_VALIDATION),1)
|
||||
@ -388,6 +396,18 @@ $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
|
||||
$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
|
||||
$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
|
||||
|
||||
# combine symversions for later processing
|
||||
quiet_cmd_update_lto_symversions = SYMVER $@
|
||||
ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y)
|
||||
cmd_update_lto_symversions = \
|
||||
rm -f $@.symversions \
|
||||
$(foreach n, $(filter-out FORCE,$^), \
|
||||
$(if $(wildcard $(n).symversions), \
|
||||
; cat $(n).symversions >> $@.symversions))
|
||||
else
|
||||
cmd_update_lto_symversions = echo >/dev/null
|
||||
endif
|
||||
|
||||
#
|
||||
# Rule to compile a set of .o files into one .a file (without symbol table)
|
||||
#
|
||||
@ -395,8 +415,11 @@ $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
|
||||
quiet_cmd_ar_builtin = AR $@
|
||||
cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
|
||||
|
||||
quiet_cmd_ar_and_symver = AR $@
|
||||
cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin)
|
||||
|
||||
$(obj)/built-in.a: $(real-obj-y) FORCE
|
||||
$(call if_changed,ar_builtin)
|
||||
$(call if_changed,ar_and_symver)
|
||||
|
||||
#
|
||||
# Rule to create modules.order file
|
||||
@ -416,15 +439,26 @@ $(obj)/modules.order: $(obj-m) FORCE
|
||||
#
|
||||
# Rule to compile a set of .o files into one .a file (with symbol table)
|
||||
#
|
||||
quiet_cmd_ar_lib = AR $@
|
||||
cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar)
|
||||
|
||||
$(obj)/lib.a: $(lib-y) FORCE
|
||||
$(call if_changed,ar)
|
||||
$(call if_changed,ar_lib)
|
||||
|
||||
# NOTE:
|
||||
# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
|
||||
# module is turned into a multi object module, $^ will contain header file
|
||||
# dependencies recorded in the .*.cmd file.
|
||||
ifdef CONFIG_LTO_CLANG
|
||||
quiet_cmd_link_multi-m = AR [M] $@
|
||||
cmd_link_multi-m = \
|
||||
$(cmd_update_lto_symversions); \
|
||||
rm -f $@; \
|
||||
$(AR) cDPrsT $@ $(filter %.o,$^)
|
||||
else
|
||||
quiet_cmd_link_multi-m = LD [M] $@
|
||||
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
|
||||
endif
|
||||
|
||||
$(multi-used-m): FORCE
|
||||
$(call if_changed,link_multi-m)
|
||||
|
||||
@ -119,9 +119,11 @@ target-stem = $(basename $(patsubst $(obj)/%,%,$@))
|
||||
# These flags are needed for modversions and compiling, so we define them here
|
||||
# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
|
||||
# end up in (or would, if it gets compiled in)
|
||||
name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1)))
|
||||
name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
|
||||
name-fix = $(call stringify,$(call name-fix-token,$1))
|
||||
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
|
||||
modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
|
||||
modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
|
||||
-D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
|
||||
modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
|
||||
|
||||
_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
|
||||
|
||||
@ -30,6 +30,12 @@ quiet_cmd_cc_o_c = CC [M] $@
|
||||
|
||||
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
|
||||
|
||||
ifdef CONFIG_LTO_CLANG
|
||||
# With CONFIG_LTO_CLANG, reuse the object file we compiled for modpost to
|
||||
# avoid a second slow LTO link
|
||||
prelink-ext := .lto
|
||||
endif
|
||||
|
||||
quiet_cmd_ld_ko_o = LD [M] $@
|
||||
cmd_ld_ko_o = \
|
||||
$(LD) -r $(KBUILD_LDFLAGS) \
|
||||
@ -53,8 +59,9 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
|
||||
$(cmd); \
|
||||
printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
|
||||
|
||||
|
||||
# Re-generate module BTFs if either module's .ko or vmlinux changed
|
||||
$(modules): %.ko: %.o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
|
||||
$(modules): %.ko: %$(prelink-ext).o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
|
||||
+$(call if_changed_except,ld_ko_o,vmlinux)
|
||||
ifdef CONFIG_DEBUG_INFO_BTF_MODULES
|
||||
+$(if $(newer-prereqs),$(call cmd,btf_ko))
|
||||
|
||||
@ -43,6 +43,9 @@ __modpost:
|
||||
include include/config/auto.conf
|
||||
include scripts/Kbuild.include
|
||||
|
||||
# for ld_flags
|
||||
include scripts/Makefile.lib
|
||||
|
||||
MODPOST = scripts/mod/modpost \
|
||||
$(if $(CONFIG_MODVERSIONS),-m) \
|
||||
$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
|
||||
@ -102,12 +105,30 @@ $(input-symdump):
|
||||
@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
|
||||
@echo >&2 ' Modules may not have dependencies or modversions.'
|
||||
|
||||
ifdef CONFIG_LTO_CLANG
|
||||
# With CONFIG_LTO_CLANG, .o files might be LLVM bitcode, so we need to run
|
||||
# LTO to compile them into native code before running modpost
|
||||
prelink-ext := .lto
|
||||
|
||||
quiet_cmd_cc_lto_link_modules = LTO [M] $@
|
||||
cmd_cc_lto_link_modules = \
|
||||
$(LD) $(ld_flags) -r -o $@ \
|
||||
$(shell [ -s $(@:.lto.o=.o.symversions) ] && \
|
||||
echo -T $(@:.lto.o=.o.symversions)) \
|
||||
--whole-archive $^
|
||||
|
||||
%.lto.o: %.o
|
||||
$(call if_changed,cc_lto_link_modules)
|
||||
endif
|
||||
|
||||
modules := $(sort $(shell cat $(MODORDER)))
|
||||
|
||||
# Read out modules.order to pass in modpost.
|
||||
# Otherwise, allmodconfig would fail with "Argument list too long".
|
||||
quiet_cmd_modpost = MODPOST $@
|
||||
cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
|
||||
cmd_modpost = sed 's/\.ko$$/$(prelink-ext)\.o/' $< | $(MODPOST) -T -
|
||||
|
||||
$(output-symdump): $(MODORDER) $(input-symdump) FORCE
|
||||
$(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(prelink-ext).o) FORCE
|
||||
$(call if_changed,modpost)
|
||||
|
||||
targets += $(output-symdump)
|
||||
|
||||
270
scripts/generate_initcall_order.pl
Executable file
270
scripts/generate_initcall_order.pl
Executable file
@ -0,0 +1,270 @@
|
||||
#!/usr/bin/env perl
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
#
|
||||
# Generates a linker script that specifies the correct initcall order.
|
||||
#
|
||||
# Copyright (C) 2019 Google LLC
|
||||
|
||||
use strict;
|
||||
use warnings;
|
||||
use IO::Handle;
|
||||
use IO::Select;
|
||||
use POSIX ":sys_wait_h";
|
||||
|
||||
my $nm = $ENV{'NM'} || die "$0: ERROR: NM not set?";
|
||||
my $objtree = $ENV{'objtree'} || '.';
|
||||
|
||||
## currently active child processes
|
||||
my $jobs = {}; # child process pid -> file handle
|
||||
## results from child processes
|
||||
my $results = {}; # object index -> [ { level, secname }, ... ]
|
||||
|
||||
## reads _NPROCESSORS_ONLN to determine the maximum number of processes to
|
||||
## start
|
||||
sub get_online_processors {
|
||||
open(my $fh, "getconf _NPROCESSORS_ONLN 2>/dev/null |")
|
||||
or die "$0: ERROR: failed to execute getconf: $!";
|
||||
my $procs = <$fh>;
|
||||
close($fh);
|
||||
|
||||
if (!($procs =~ /^\d+$/)) {
|
||||
return 1;
|
||||
}
|
||||
|
||||
return int($procs);
|
||||
}
|
||||
|
||||
## writes results to the parent process
|
||||
## format: <file index> <initcall level> <base initcall section name>
|
||||
sub write_results {
|
||||
my ($index, $initcalls) = @_;
|
||||
|
||||
# sort by the counter value to ensure the order of initcalls within
|
||||
# each object file is correct
|
||||
foreach my $counter (sort { $a <=> $b } keys(%{$initcalls})) {
|
||||
my $level = $initcalls->{$counter}->{'level'};
|
||||
|
||||
# section name for the initcall function
|
||||
my $secname = $initcalls->{$counter}->{'module'} . '__' .
|
||||
$counter . '_' .
|
||||
$initcalls->{$counter}->{'line'} . '_' .
|
||||
$initcalls->{$counter}->{'function'};
|
||||
|
||||
print "$index $level $secname\n";
|
||||
}
|
||||
}
|
||||
|
||||
## reads a result line from a child process and adds it to the $results array
|
||||
sub read_results{
|
||||
my ($fh) = @_;
|
||||
|
||||
# each child prints out a full line w/ autoflush and exits after the
|
||||
# last line, so even if buffered I/O blocks here, it shouldn't block
|
||||
# very long
|
||||
my $data = <$fh>;
|
||||
|
||||
if (!defined($data)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
chomp($data);
|
||||
|
||||
my ($index, $level, $secname) = $data =~
|
||||
/^(\d+)\ ([^\ ]+)\ (.*)$/;
|
||||
|
||||
if (!defined($index) ||
|
||||
!defined($level) ||
|
||||
!defined($secname)) {
|
||||
die "$0: ERROR: child process returned invalid data: $data\n";
|
||||
}
|
||||
|
||||
$index = int($index);
|
||||
|
||||
if (!exists($results->{$index})) {
|
||||
$results->{$index} = [];
|
||||
}
|
||||
|
||||
push (@{$results->{$index}}, {
|
||||
'level' => $level,
|
||||
'secname' => $secname
|
||||
});
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
## finds initcalls from an object file or all object files in an archive, and
|
||||
## writes results back to the parent process
|
||||
sub find_initcalls {
|
||||
my ($index, $file) = @_;
|
||||
|
||||
die "$0: ERROR: file $file doesn't exist?" if (! -f $file);
|
||||
|
||||
open(my $fh, "\"$nm\" --defined-only \"$file\" 2>/dev/null |")
|
||||
or die "$0: ERROR: failed to execute \"$nm\": $!";
|
||||
|
||||
my $initcalls = {};
|
||||
|
||||
while (<$fh>) {
|
||||
chomp;
|
||||
|
||||
# check for the start of a new object file (if processing an
|
||||
# archive)
|
||||
my ($path)= $_ =~ /^(.+)\:$/;
|
||||
|
||||
if (defined($path)) {
|
||||
write_results($index, $initcalls);
|
||||
$initcalls = {};
|
||||
next;
|
||||
}
|
||||
|
||||
# look for an initcall
|
||||
my ($module, $counter, $line, $symbol) = $_ =~
|
||||
/[a-z]\s+__initcall__(\S*)__(\d+)_(\d+)_(.*)$/;
|
||||
|
||||
if (!defined($module)) {
|
||||
$module = ''
|
||||
}
|
||||
|
||||
if (!defined($counter) ||
|
||||
!defined($line) ||
|
||||
!defined($symbol)) {
|
||||
next;
|
||||
}
|
||||
|
||||
# parse initcall level
|
||||
my ($function, $level) = $symbol =~
|
||||
/^(.*)((early|rootfs|con|[0-9])s?)$/;
|
||||
|
||||
die "$0: ERROR: invalid initcall name $symbol in $file($path)"
|
||||
if (!defined($function) || !defined($level));
|
||||
|
||||
$initcalls->{$counter} = {
|
||||
'module' => $module,
|
||||
'line' => $line,
|
||||
'function' => $function,
|
||||
'level' => $level,
|
||||
};
|
||||
}
|
||||
|
||||
close($fh);
|
||||
write_results($index, $initcalls);
|
||||
}
|
||||
|
||||
## waits for any child process to complete, reads the results, and adds them to
|
||||
## the $results array for later processing
|
||||
sub wait_for_results {
|
||||
my ($select) = @_;
|
||||
|
||||
my $pid = 0;
|
||||
do {
|
||||
# unblock children that may have a full write buffer
|
||||
foreach my $fh ($select->can_read(0)) {
|
||||
read_results($fh);
|
||||
}
|
||||
|
||||
# check for children that have exited, read the remaining data
|
||||
# from them, and clean up
|
||||
$pid = waitpid(-1, WNOHANG);
|
||||
if ($pid > 0) {
|
||||
if (!exists($jobs->{$pid})) {
|
||||
next;
|
||||
}
|
||||
|
||||
my $fh = $jobs->{$pid};
|
||||
$select->remove($fh);
|
||||
|
||||
while (read_results($fh)) {
|
||||
# until eof
|
||||
}
|
||||
|
||||
close($fh);
|
||||
delete($jobs->{$pid});
|
||||
}
|
||||
} while ($pid > 0);
|
||||
}
|
||||
|
||||
## forks a child to process each file passed in the command line and collects
|
||||
## the results
|
||||
sub process_files {
|
||||
my $index = 0;
|
||||
my $njobs = $ENV{'PARALLELISM'} || get_online_processors();
|
||||
my $select = IO::Select->new();
|
||||
|
||||
while (my $file = shift(@ARGV)) {
|
||||
# fork a child process and read it's stdout
|
||||
my $pid = open(my $fh, '-|');
|
||||
|
||||
if (!defined($pid)) {
|
||||
die "$0: ERROR: failed to fork: $!";
|
||||
} elsif ($pid) {
|
||||
# save the child process pid and the file handle
|
||||
$select->add($fh);
|
||||
$jobs->{$pid} = $fh;
|
||||
} else {
|
||||
# in the child process
|
||||
STDOUT->autoflush(1);
|
||||
find_initcalls($index, "$objtree/$file");
|
||||
exit;
|
||||
}
|
||||
|
||||
$index++;
|
||||
|
||||
# limit the number of children to $njobs
|
||||
if (scalar(keys(%{$jobs})) >= $njobs) {
|
||||
wait_for_results($select);
|
||||
}
|
||||
}
|
||||
|
||||
# wait for the remaining children to complete
|
||||
while (scalar(keys(%{$jobs})) > 0) {
|
||||
wait_for_results($select);
|
||||
}
|
||||
}
|
||||
|
||||
sub generate_initcall_lds() {
|
||||
process_files();
|
||||
|
||||
my $sections = {}; # level -> [ secname, ...]
|
||||
|
||||
# sort results to retain link order and split to sections per
|
||||
# initcall level
|
||||
foreach my $index (sort { $a <=> $b } keys(%{$results})) {
|
||||
foreach my $result (@{$results->{$index}}) {
|
||||
my $level = $result->{'level'};
|
||||
|
||||
if (!exists($sections->{$level})) {
|
||||
$sections->{$level} = [];
|
||||
}
|
||||
|
||||
push(@{$sections->{$level}}, $result->{'secname'});
|
||||
}
|
||||
}
|
||||
|
||||
die "$0: ERROR: no initcalls?" if (!keys(%{$sections}));
|
||||
|
||||
# print out a linker script that defines the order of initcalls for
|
||||
# each level
|
||||
print "SECTIONS {\n";
|
||||
|
||||
foreach my $level (sort(keys(%{$sections}))) {
|
||||
my $section;
|
||||
|
||||
if ($level eq 'con') {
|
||||
$section = '.con_initcall.init';
|
||||
} else {
|
||||
$section = ".initcall${level}.init";
|
||||
}
|
||||
|
||||
print "\t${section} : {\n";
|
||||
|
||||
foreach my $secname (@{$sections->{$level}}) {
|
||||
print "\t\t*(${section}..${secname}) ;\n";
|
||||
}
|
||||
|
||||
print "\t}\n";
|
||||
}
|
||||
|
||||
print "}\n";
|
||||
}
|
||||
|
||||
generate_initcall_lds();
|
||||
@ -43,11 +43,37 @@ info()
|
||||
fi
|
||||
}
|
||||
|
||||
# Generate a linker script to ensure correct ordering of initcalls.
|
||||
gen_initcalls()
|
||||
{
|
||||
info GEN .tmp_initcalls.lds
|
||||
|
||||
${PYTHON} ${srctree}/scripts/jobserver-exec \
|
||||
${PERL} ${srctree}/scripts/generate_initcall_order.pl \
|
||||
${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \
|
||||
> .tmp_initcalls.lds
|
||||
}
|
||||
|
||||
# If CONFIG_LTO_CLANG is selected, collect generated symbol versions into
|
||||
# .tmp_symversions.lds
|
||||
gen_symversions()
|
||||
{
|
||||
info GEN .tmp_symversions.lds
|
||||
rm -f .tmp_symversions.lds
|
||||
|
||||
for o in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
|
||||
if [ -f ${o}.symversions ]; then
|
||||
cat ${o}.symversions >> .tmp_symversions.lds
|
||||
fi
|
||||
done
|
||||
}
|
||||
|
||||
# Link of vmlinux.o used for section mismatch analysis
|
||||
# ${1} output file
|
||||
modpost_link()
|
||||
{
|
||||
local objects
|
||||
local lds=""
|
||||
|
||||
objects="--whole-archive \
|
||||
${KBUILD_VMLINUX_OBJS} \
|
||||
@ -56,7 +82,23 @@ modpost_link()
|
||||
${KBUILD_VMLINUX_LIBS} \
|
||||
--end-group"
|
||||
|
||||
${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects}
|
||||
if [ -n "${CONFIG_LTO_CLANG}" ]; then
|
||||
gen_initcalls
|
||||
lds="-T .tmp_initcalls.lds"
|
||||
|
||||
if [ -n "${CONFIG_MODVERSIONS}" ]; then
|
||||
gen_symversions
|
||||
lds="${lds} -T .tmp_symversions.lds"
|
||||
fi
|
||||
|
||||
# This might take a while, so indicate that we're doing
|
||||
# an LTO link
|
||||
info LTO ${1}
|
||||
else
|
||||
info LD ${1}
|
||||
fi
|
||||
|
||||
${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects}
|
||||
}
|
||||
|
||||
objtool_link()
|
||||
@ -103,13 +145,22 @@ vmlinux_link()
|
||||
fi
|
||||
|
||||
if [ "${SRCARCH}" != "um" ]; then
|
||||
objects="--whole-archive \
|
||||
${KBUILD_VMLINUX_OBJS} \
|
||||
--no-whole-archive \
|
||||
--start-group \
|
||||
${KBUILD_VMLINUX_LIBS} \
|
||||
--end-group \
|
||||
${@}"
|
||||
if [ -n "${CONFIG_LTO_CLANG}" ]; then
|
||||
# Use vmlinux.o instead of performing the slow LTO
|
||||
# link again.
|
||||
objects="--whole-archive \
|
||||
vmlinux.o \
|
||||
--no-whole-archive \
|
||||
${@}"
|
||||
else
|
||||
objects="--whole-archive \
|
||||
${KBUILD_VMLINUX_OBJS} \
|
||||
--no-whole-archive \
|
||||
--start-group \
|
||||
${KBUILD_VMLINUX_LIBS} \
|
||||
--end-group \
|
||||
${@}"
|
||||
fi
|
||||
|
||||
${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
|
||||
${strip_debug#-Wl,} \
|
||||
@ -225,6 +276,8 @@ cleanup()
|
||||
{
|
||||
rm -f .btf.*
|
||||
rm -f .tmp_System.map
|
||||
rm -f .tmp_initcalls.lds
|
||||
rm -f .tmp_symversions.lds
|
||||
rm -f .tmp_vmlinux*
|
||||
rm -f System.map
|
||||
rm -f vmlinux
|
||||
@ -274,7 +327,6 @@ fi;
|
||||
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
|
||||
|
||||
#link vmlinux.o
|
||||
info LD vmlinux.o
|
||||
modpost_link vmlinux.o
|
||||
objtool_link vmlinux.o
|
||||
|
||||
|
||||
5
scripts/lto-used-symbollist.txt
Normal file
5
scripts/lto-used-symbollist.txt
Normal file
@ -0,0 +1,5 @@
|
||||
memcpy
|
||||
memmove
|
||||
memset
|
||||
__stack_chk_fail
|
||||
__stack_chk_guard
|
||||
@ -1,5 +1,6 @@
|
||||
# SPDX-License-Identifier: GPL-2.0
|
||||
OBJECT_FILES_NON_STANDARD := y
|
||||
CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO)
|
||||
|
||||
hostprogs-always-y += modpost mk_elfconfig
|
||||
always-y += empty.o
|
||||
|
||||
@ -17,7 +17,6 @@
|
||||
#include <ctype.h>
|
||||
#include <string.h>
|
||||
#include <limits.h>
|
||||
#include <stdbool.h>
|
||||
#include <errno.h>
|
||||
#include "modpost.h"
|
||||
#include "../../include/linux/license.h"
|
||||
@ -84,14 +83,6 @@ modpost_log(enum loglevel loglevel, const char *fmt, ...)
|
||||
error_occurred = true;
|
||||
}
|
||||
|
||||
static inline bool strends(const char *str, const char *postfix)
|
||||
{
|
||||
if (strlen(str) < strlen(postfix))
|
||||
return false;
|
||||
|
||||
return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
|
||||
}
|
||||
|
||||
void *do_nofail(void *ptr, const char *expr)
|
||||
{
|
||||
if (!ptr)
|
||||
@ -1988,6 +1979,10 @@ static char *remove_dot(char *s)
|
||||
size_t m = strspn(s + n + 1, "0123456789");
|
||||
if (m && (s[n + m] == '.' || s[n + m] == 0))
|
||||
s[n] = 0;
|
||||
|
||||
/* strip trailing .lto */
|
||||
if (strends(s, ".lto"))
|
||||
s[strlen(s) - 4] = '\0';
|
||||
}
|
||||
return s;
|
||||
}
|
||||
@ -2011,6 +2006,9 @@ static void read_symbols(const char *modname)
|
||||
/* strip trailing .o */
|
||||
tmp = NOFAIL(strdup(modname));
|
||||
tmp[strlen(tmp) - 2] = '\0';
|
||||
/* strip trailing .lto */
|
||||
if (strends(tmp, ".lto"))
|
||||
tmp[strlen(tmp) - 4] = '\0';
|
||||
mod = new_module(tmp);
|
||||
free(tmp);
|
||||
}
|
||||
|
||||
@ -2,6 +2,7 @@
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdarg.h>
|
||||
#include <stdbool.h>
|
||||
#include <string.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
@ -180,6 +181,14 @@ static inline unsigned int get_secindex(const struct elf_info *info,
|
||||
return info->symtab_shndx_start[sym - info->symtab_start];
|
||||
}
|
||||
|
||||
static inline bool strends(const char *str, const char *postfix)
|
||||
{
|
||||
if (strlen(str) < strlen(postfix))
|
||||
return false;
|
||||
|
||||
return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
|
||||
}
|
||||
|
||||
/* file2alias.c */
|
||||
extern unsigned int cross_build;
|
||||
void handle_moddevtable(struct module *mod, struct elf_info *info,
|
||||
|
||||
@ -391,10 +391,14 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen)
|
||||
struct md4_ctx md;
|
||||
char *fname;
|
||||
char filelist[PATH_MAX + 1];
|
||||
int postfix_len = 1;
|
||||
|
||||
if (strends(modname, ".lto.o"))
|
||||
postfix_len = 5;
|
||||
|
||||
/* objects for a module are listed in the first line of *.mod file. */
|
||||
snprintf(filelist, sizeof(filelist), "%.*smod",
|
||||
(int)strlen(modname) - 1, modname);
|
||||
(int)strlen(modname) - postfix_len, modname);
|
||||
|
||||
buf = read_text_file(filelist);
|
||||
|
||||
|
||||
@ -23,6 +23,30 @@ SECTIONS {
|
||||
.init_array 0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }
|
||||
|
||||
__jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) }
|
||||
|
||||
__patchable_function_entries : { *(__patchable_function_entries) }
|
||||
|
||||
/*
|
||||
* With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and
|
||||
* -ffunction-sections, which increases the size of the final module.
|
||||
* Merge the split sections in the final binary.
|
||||
*/
|
||||
.bss : {
|
||||
*(.bss .bss.[0-9a-zA-Z_]*)
|
||||
*(.bss..L*)
|
||||
}
|
||||
|
||||
.data : {
|
||||
*(.data .data.[0-9a-zA-Z_]*)
|
||||
*(.data..L*)
|
||||
}
|
||||
|
||||
.rodata : {
|
||||
*(.rodata .rodata.[0-9a-zA-Z_]*)
|
||||
*(.rodata..L*)
|
||||
}
|
||||
|
||||
.text : { *(.text .text.[0-9a-zA-Z_]*) }
|
||||
}
|
||||
|
||||
/* bring in arch-specific sections */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user