Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6:
  kbuild: make KBUILD_NOCMDDEP=1 handle empty built-in.o
  scripts/kallsyms.c: fix potential segfault
  scripts/gen_initramfs_list.sh: Convert to a /bin/sh script
  kbuild: Fix GNU make v3.80 compatibility
  kbuild: Fix passing -Wno-* options to gcc 4.4+
  kbuild: move scripts/basic/docproc.c to scripts/docproc.c
  kbuild: Fix Makefile.asm-generic for um
  kbuild: Allow to combine multiple W= levels
  kbuild: Disable -Wunused-but-set-variable for gcc 4.6.0
  Fix handling of backlash character in LINUX_COMPILE_BY name
  kbuild: asm-generic support
  kbuild: implement several W= levels
  kbuild: Fix build with binutils <= 2.19
  initramfs: Use KBUILD_BUILD_TIMESTAMP for generated entries
  kbuild: Allow to override LINUX_COMPILE_BY and LINUX_COMPILE_HOST macros
  kbuild: Drop unused LINUX_COMPILE_TIME and LINUX_COMPILE_DOMAIN macros
  kbuild: Use the deterministic mode of ar
  kbuild: Call gzip with -n
  kbuild: move KALLSYMS_EXTRA_PASS from Kconfig to Makefile
  Kconfig: improve KALLSYMS_ALL documentation

Fix up trivial conflict in Makefile

.gitignore

@@ -57,6 +57,7 @@ modules.builtin
 include/config
 include/linux/version.h
 include/generated
+arch/*/include/generated
 
 # stgit generated dirs
 patches-*

Documentation/DocBook/Makefile

@@ -73,7 +73,7 @@ installmandocs: mandocs
 ###
 #External programs used
 KERNELDOC = $(srctree)/scripts/kernel-doc
-DOCPROC   = $(objtree)/scripts/basic/docproc
+DOCPROC   = $(objtree)/scripts/docproc
 
 XMLTOFLAGS = -m $(srctree)/Documentation/DocBook/stylesheet.xsl
 XMLTOFLAGS += --skip-validation

Documentation/kbuild/kbuild.txt

@@ -201,3 +201,16 @@ KBUILD_ENABLE_EXTRA_GCC_CHECKS
 --------------------------------------------------
 If enabled over the make command line with "W=1", it turns on additional
 gcc -W... options for more extensive build-time checking.
+
+KBUILD_BUILD_TIMESTAMP
+--------------------------------------------------
+Setting this to a date string overrides the timestamp used in the
+UTS_VERSION definition (uname -v in the running kernel). The value has to
+be a string that can be passed to date -d. The default value
+is the output of the date command at one point during build.
+
+KBUILD_BUILD_USER, KBUILD_BUILD_HOST
+--------------------------------------------------
+These two variables allow to override the user@host string displayed during
+boot and in /proc/version. The default value is the output of the commands
+whoami and host, respectively.

Documentation/kbuild/makefiles.txt

@@ -40,11 +40,13 @@ This document describes the Linux kernel Makefiles.
 	   --- 6.6 Commands useful for building a boot image
 	   --- 6.7 Custom kbuild commands
 	   --- 6.8 Preprocessing linker scripts
+	   --- 6.9 Generic header files
 
 	=== 7 Kbuild syntax for exported headers
 		--- 7.1 header-y
 		--- 7.2 objhdr-y
 		--- 7.3 destination-y
+		--- 7.4 generic-y
 
 	=== 8 Kbuild Variables
 	=== 9 Makefile language
@@ -499,6 +501,18 @@ more details, with real examples.
 	gcc >= 3.00. For gcc < 3.00, -malign-functions=4 is used.
 	Note: cc-option-align uses KBUILD_CFLAGS for $(CC) options
 
+    cc-disable-warning
+	cc-disable-warning checks if gcc supports a given warning and returns
+	the commandline switch to disable it. This special function is needed,
+	because gcc 4.4 and later accept any unknown -Wno-* option and only
+	warn about it if there is another warning in the source file.
+
+	Example:
+		KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
+
+	In the above example, -Wno-unused-but-set-variable will be added to
+	KBUILD_CFLAGS only if gcc really accepts it.
+
     cc-version
 	cc-version returns a numerical version of the $(CC) compiler version.
 	The format is <major><minor> where both are two digits. So for example
@@ -955,6 +969,11 @@ When kbuild executes, the following steps are followed (roughly):
 	used when linking modules. This is often a linker script.
 	From commandline LDFLAGS_MODULE shall be used (see kbuild.txt).
 
+    KBUILD_ARFLAGS   Options for $(AR) when creating archives
+
+	$(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
+	mode) if this option is supported by $(AR).
+
 --- 6.2 Add prerequisites to archprepare:
 
 	The archprepare: rule is used to list prerequisites that need to be
@@ -1209,6 +1228,14 @@ When kbuild executes, the following steps are followed (roughly):
 	The kbuild infrastructure for *lds file are used in several
 	architecture-specific files.
 
+--- 6.9 Generic header files
+
+	The directory include/asm-generic contains the header files
+	that may be shared between individual architectures.
+	The recommended approach how to use a generic header file is
+	to list the file in the Kbuild file.
+	See "7.4 generic-y" for further info on syntax etc.
+
 === 7 Kbuild syntax for exported headers
 
 The kernel include a set of headers that is exported to userspace.
@@ -1265,6 +1292,32 @@ See subsequent chapter for the syntax of the Kbuild file.
 	In the example above all exported headers in the Kbuild file
 	will be located in the directory "include/linux" when exported.
 
+	--- 7.4 generic-y
+
+	If an architecture uses a verbatim copy of a header from
+	include/asm-generic then this is listed in the file
+	arch/$(ARCH)/include/asm/Kbuild like this:
+
+		Example:
+			#arch/x86/include/asm/Kbuild
+			generic-y += termios.h
+			generic-y += rtc.h
+
+	During the prepare phase of the build a wrapper include
+	file is generated in the directory:
+
+		arch/$(ARCH)/include/generated/asm
+
+	When a header is exported where the architecture uses
+	the generic header a similar wrapper is generated as part
+	of the set of exported headers in the directory:
+
+		usr/include/asm
+
+	The generated wrapper will in both cases look like the following:
+
+		Example: termios.h
+			#include <asm-generic/termios.h>
 
 === 8 Kbuild Variables
 

Makefile

@@ -103,7 +103,7 @@ ifeq ("$(origin O)", "command line")
 endif
 
 ifeq ("$(origin W)", "command line")
-  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1
+  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
 endif
 
 # That's our default target when none is given on the command line
@@ -349,7 +349,8 @@ CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage
 
 # Use LINUXINCLUDE when you must reference the include/ directory.
 # Needed to be compatible with the O= option
-LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
+LINUXINCLUDE    := -I$(srctree)/arch/$(hdr-arch)/include \
+                   -Iarch/$(hdr-arch)/include/generated -Iinclude \
                    $(if $(KBUILD_SRC), -I$(srctree)/include) \
                    -include include/generated/autoconf.h
 
@@ -382,6 +383,7 @@ export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
+export KBUILD_ARFLAGS
 
 # When compiling out-of-tree modules, put MODVERDIR in the module
 # tree rather than in the kernel tree. The kernel tree might
@@ -416,6 +418,12 @@ ifneq ($(KBUILD_SRC),)
 	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
 endif
 
+# Support for using generic headers in asm-generic
+PHONY += asm-generic
+asm-generic:
+	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
+	            obj=arch/$(SRCARCH)/include/generated/asm
+
 # To make sure we do not include .config for any of the *config targets
 # catch them early, and hand them over to scripts/kconfig/Makefile
 # It is allowed to specify more targets when calling make, including
@@ -559,6 +567,10 @@ ifndef CONFIG_CC_STACKPROTECTOR
 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
 endif
 
+# This warning generated too much noise in a regular build.
+# Use make W=1 to enable this warning (see scripts/Makefile.build)
+KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
+
 ifdef CONFIG_FRAME_POINTER
 KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
 else
@@ -604,7 +616,7 @@ CHECKFLAGS     += $(NOSTDINC_FLAGS)
 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
 
 # disable pointer signed / unsigned warnings in gcc 4.0
-KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
+KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
 
 # disable invalid "can't wrap" optimizations for signed / pointers
 KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
@@ -612,6 +624,9 @@ KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
 # conserve stack if available
 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 
+# use the deterministic mode of AR if available
+KBUILD_ARFLAGS := $(call ar-option,D)
+
 # check for 'asm goto'
 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
 	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
@@ -797,15 +812,17 @@ ifdef CONFIG_KALLSYMS
 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
 # o Verify that the System.map from vmlinux matches the map from
 #   .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
-# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
+# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
 #   .tmp_vmlinux3 and .tmp_kallsyms3.o.  This is only meant as a
 #   temporary bypass to allow the kernel to be built while the
 #   maintainers work out what went wrong with kallsyms.
 
-ifdef CONFIG_KALLSYMS_EXTRA_PASS
-last_kallsyms := 3
-else
 last_kallsyms := 2
+
+ifdef KALLSYMS_EXTRA_PASS
+ifneq ($(KALLSYMS_EXTRA_PASS),0)
+last_kallsyms := 3
+endif
 endif
 
 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
@@ -816,7 +833,8 @@ define verify_kallsyms
 	  $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
 	$(Q)cmp -s System.map .tmp_System.map ||                             \
 		(echo Inconsistent kallsyms data;                            \
-		 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS;                \
+		 echo This is a bug - please report about it;                \
+		 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround;      \
 		 rm .tmp_kallsyms* ; /bin/false )
 endef
 
@@ -947,7 +965,7 @@ ifneq ($(KBUILD_SRC),)
 endif
 
 # prepare2 creates a makefile if using a separate output directory
-prepare2: prepare3 outputmakefile
+prepare2: prepare3 outputmakefile asm-generic
 
 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
                    include/config/auto.conf
@@ -1021,7 +1039,7 @@ hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
 
 PHONY += __headers
-__headers: include/linux/version.h scripts_basic FORCE
+__headers: include/linux/version.h scripts_basic asm-generic FORCE
 	$(Q)$(MAKE) $(build)=scripts build_unifdef
 
 PHONY += headers_install_all
@@ -1136,7 +1154,8 @@ CLEAN_FILES +=	vmlinux System.map \
                 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
 
 # Directories & files removed with 'make mrproper'
-MRPROPER_DIRS  += include/config usr/include include/generated
+MRPROPER_DIRS  += include/config usr/include include/generated          \
+                  arch/*/include/generated
 MRPROPER_FILES += .config .config.old .version .old_version             \
                   include/linux/version.h                               \
 		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
@@ -1267,7 +1286,11 @@ help:
 	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
 	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
 	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
-	@echo  '  make W=1   [targets] Enable extra gcc checks'
+	@echo  '  make W=n   [targets] Enable extra gcc 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  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
 	@echo  ''
 	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
@@ -1291,6 +1314,7 @@ $(help-board-dirs): help-%:
 # Documentation targets
 # ---------------------------------------------------------------------------
 %docs: scripts_basic FORCE
+	$(Q)$(MAKE) $(build)=scripts build_docproc
 	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
 
 else # KBUILD_EXTMOD
@@ -1375,7 +1399,7 @@ endif # KBUILD_EXTMOD
 clean: $(clean-dirs)
 	$(call cmd,rmdirs)
 	$(call cmd,rmfiles)
-	@find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
+	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
 		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
 		-o -name '*.symtypes' -o -name 'modules.order' \

init/Kconfig

@@ -959,24 +959,18 @@ config KALLSYMS_ALL
 	bool "Include all symbols in kallsyms"
 	depends on DEBUG_KERNEL && KALLSYMS
 	help
-	   Normally kallsyms only contains the symbols of functions, for nicer
+	   Normally kallsyms only contains the symbols of functions for nicer
-	   OOPS messages.  Some debuggers can use kallsyms for other
+	   OOPS messages and backtraces (i.e., symbols from the text and inittext
-	   symbols too: say Y here to include all symbols, if you need them 
+	   sections). This is sufficient for most cases. And only in very rare
-	   and you don't care about adding 300k to the size of your kernel.
+	   cases (e.g., when a debugger is used) all symbols are required (e.g.,
+	   names of variables from the data sections, etc).
 
-	   Say N.
+	   This option makes sure that all symbols are loaded into the kernel
-
+	   image (i.e., symbols from all sections) in cost of increased kernel
-config KALLSYMS_EXTRA_PASS
+	   size (depending on the kernel configuration, it may be 300KiB or
-	bool "Do an extra kallsyms pass"
+	   something like this).
-	depends on KALLSYMS
-	help
-	   If kallsyms is not working correctly, the build will fail with
-	   inconsistent kallsyms data.  If that occurs, log a bug report and
-	   turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
-	   Always say N here unless you find a bug in kallsyms, which must be
-	   reported.  KALLSYMS_EXTRA_PASS is only a temporary workaround while
-	   you wait for kallsyms to be fixed.
 
+	   Say N unless you really need all symbols.
 
 config HOTPLUG
 	bool "Support for hot-pluggable devices" if EXPERT

scripts/.gitignore

@@ -8,3 +8,4 @@ bin2c
 unifdef
 ihex2fw
 recordmcount
+docproc

scripts/Kbuild.include

@@ -118,6 +118,11 @@ cc-option-yn = $(call try-run,\
 cc-option-align = $(subst -functions=0,,\
 	$(call cc-option,-falign-functions=0,-malign-functions=0))
 
+# cc-disable-warning
+# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
+cc-disable-warning = $(call try-run,\
+	$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1)))
+
 # cc-version
 # Usage gcc-ver := $(call cc-version)
 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
@@ -141,6 +146,11 @@ cc-ldoption = $(call try-run,\
 ld-option = $(call try-run,\
 	$(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
 
+# ar-option
+# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
+# Important: no spaces around options
+ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
+
 ######
 
 ###
@@ -187,6 +197,8 @@ ifneq ($(KBUILD_NOCMDDEP),1)
 # User may override this check using make KBUILD_NOCMDDEP=1
 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
                     $(filter-out $(cmd_$@),   $(cmd_$(1))) )
+else
+arg-check = $(if $(strip $(cmd_$@)),,1)
 endif
 
 # >'< substitution is for echo to work,

scripts/Makefile

@@ -6,6 +6,7 @@
 # pnmttologo:    Convert pnm files to logo files
 # conmakehash:   Create chartable
 # conmakehash:	 Create arrays for initializing the kernel console tables
+# docproc:       Used in Documentation/DocBook
 
 hostprogs-$(CONFIG_KALLSYMS)     += kallsyms
 hostprogs-$(CONFIG_LOGO)         += pnmtologo
@@ -16,12 +17,14 @@ hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
 always		:= $(hostprogs-y) $(hostprogs-m)
 
 # The following hostprogs-y programs are only build on demand
-hostprogs-y += unifdef
+hostprogs-y += unifdef docproc
 
-# This target is used internally to avoid "is up to date" messages
+# These targets are used internally to avoid "is up to date" messages
 PHONY += build_unifdef
 build_unifdef: scripts/unifdef FORCE
 	@:
+build_docproc: scripts/docproc FORCE
+	@:
 
 subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-y                     += mod

scripts/Makefile.asm-generic

@@ -0,0 +1,23 @@
+# include/asm-generic contains a lot of files that are used
+# verbatim by several architectures.
+#
+# This Makefile reads the file arch/$(SRCARCH)/include/asm/Kbuild
+# and for each file listed in this file with generic-y creates
+# a small wrapper file in $(obj) (arch/$(SRCARCH)/include/generated/asm)
+
+kbuild-file := $(srctree)/arch/$(SRCARCH)/include/asm/Kbuild
+-include $(kbuild-file)
+
+include scripts/Kbuild.include
+
+# Create output directory if not already present
+_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
+
+quiet_cmd_wrap = WRAP    $@
+cmd_wrap = echo "\#include <asm-generic/$*.h>" >$@
+
+all: $(patsubst %, $(obj)/%, $(generic-y))
+
+$(obj)/%.h:
+	$(call cmd,wrap)
+

scripts/Makefile.build

@@ -51,36 +51,52 @@ ifeq ($(KBUILD_NOPEDANTIC),)
 endif
 
 #
-# make W=1 settings
+# make W=... settings
 #
-# $(call cc-option... ) handles gcc -W.. options which
+# W=1 - warnings that may be relevant and does not occur too often
+# W=2 - warnings that occur quite often but may still be relevant
+# W=3 - the more obscure warnings, can most likely be ignored
+#
+# $(call cc-option, -W...) handles gcc -W.. options which
 # are not supported by all versions of the compiler
 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
-KBUILD_EXTRA_WARNINGS := -Wextra
+warning-  := $(empty)
-KBUILD_EXTRA_WARNINGS += -Wunused -Wno-unused-parameter
+
-KBUILD_EXTRA_WARNINGS += -Waggregate-return
+warning-1 := -Wextra -Wunused -Wno-unused-parameter
-KBUILD_EXTRA_WARNINGS += -Wbad-function-cast
+warning-1 += -Wmissing-declarations
-KBUILD_EXTRA_WARNINGS += -Wcast-qual
+warning-1 += -Wmissing-format-attribute
-KBUILD_EXTRA_WARNINGS += -Wcast-align
+warning-1 += -Wmissing-prototypes
-KBUILD_EXTRA_WARNINGS += -Wconversion
+warning-1 += -Wold-style-definition
-KBUILD_EXTRA_WARNINGS += -Wdisabled-optimization
+warning-1 += $(call cc-option, -Wmissing-include-dirs)
-KBUILD_EXTRA_WARNINGS += -Wlogical-op
+warning-1 += $(call cc-option, -Wunused-but-set-variable)
-KBUILD_EXTRA_WARNINGS += -Wmissing-declarations
+
-KBUILD_EXTRA_WARNINGS += -Wmissing-format-attribute
+warning-2 := -Waggregate-return
-KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wmissing-include-dirs,)
+warning-2 += -Wcast-align
-KBUILD_EXTRA_WARNINGS += -Wmissing-prototypes
+warning-2 += -Wdisabled-optimization
-KBUILD_EXTRA_WARNINGS += -Wnested-externs
+warning-2 += -Wnested-externs
-KBUILD_EXTRA_WARNINGS += -Wold-style-definition
+warning-2 += -Wshadow
-KBUILD_EXTRA_WARNINGS += $(call cc-option, -Woverlength-strings,)
+warning-2 += $(call cc-option, -Wlogical-op)
-KBUILD_EXTRA_WARNINGS += -Wpacked
+
-KBUILD_EXTRA_WARNINGS += -Wpacked-bitfield-compat
+warning-3 := -Wbad-function-cast
-KBUILD_EXTRA_WARNINGS += -Wpadded
+warning-3 += -Wcast-qual
-KBUILD_EXTRA_WARNINGS += -Wpointer-arith
+warning-3 += -Wconversion
-KBUILD_EXTRA_WARNINGS += -Wredundant-decls
+warning-3 += -Wpacked
-KBUILD_EXTRA_WARNINGS += -Wshadow
+warning-3 += -Wpadded
-KBUILD_EXTRA_WARNINGS += -Wswitch-default
+warning-3 += -Wpointer-arith
-KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wvla,)
+warning-3 += -Wredundant-decls
-KBUILD_CFLAGS += $(KBUILD_EXTRA_WARNINGS)
+warning-3 += -Wswitch-default
+warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
+warning-3 += $(call cc-option, -Wvla)
+
+warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
+
+ifeq ("$(strip $(warning))","")
+        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
+endif
+
+KBUILD_CFLAGS += $(warning)
 endif
 
 include scripts/Makefile.lib
@@ -351,7 +367,7 @@ quiet_cmd_link_o_target = LD      $@
 cmd_link_o_target = $(if $(strip $(obj-y)),\
 		      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
 		      $(cmd_secanalysis),\
-		      rm -f $@; $(AR) rcs $@)
+		      rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
 
 $(builtin-target): $(obj-y) FORCE
 	$(call if_changed,link_o_target)
@@ -377,7 +393,7 @@ $(modorder-target): $(subdir-ym) FORCE
 #
 ifdef lib-target
 quiet_cmd_link_l_target = AR      $@
-cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
+cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
 
 $(lib-target): $(lib-y) FORCE
 	$(call if_changed,link_l_target)

scripts/Makefile.headersinst

@@ -27,8 +27,13 @@ header-y      := $(filter-out %/, $(header-y))
 install-file  := $(install)/.install
 check-file    := $(install)/.check
 
+# generic-y list all files an architecture uses from asm-generic
+# Use this to build a list of headers which require a wrapper
+wrapper-files := $(filter $(header-y), $(generic-y))
+
 # all headers files for this dir
-all-files     := $(header-y) $(objhdr-y)
+header-y      := $(filter-out $(generic-y), $(header-y))
+all-files     := $(header-y) $(objhdr-y) $(wrapper-files)
 input-files   := $(addprefix $(srctree)/$(obj)/,$(header-y)) \
                  $(addprefix $(objtree)/$(obj)/,$(objhdr-y))
 output-files  := $(addprefix $(install)/, $(all-files))
@@ -47,6 +52,9 @@ quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
       cmd_install = \
         $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
         $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \
+        for F in $(wrapper-files); do                                   \
+                echo "\#include <asm-generic/$$F>" > $(install)/$$F;    \
+        done;                                                           \
         touch $@
 
 quiet_cmd_remove = REMOVE  $(unwanted)

scripts/Makefile.lib

@@ -197,7 +197,7 @@ cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 # ---------------------------------------------------------------------------
 
 quiet_cmd_gzip = GZIP    $@
-cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
+cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 	(rm -f $@ ; false)
 
 # DTC

scripts/basic/.gitignore

@@ -1,3 +1 @@
-hash
 fixdep
-docproc

scripts/basic/Makefile

@@ -7,9 +7,8 @@
 # .config is included by main Makefile.
 # ---------------------------------------------------------------------------
 # fixdep: 	 Used to generate dependency information during build process
-# docproc:	 Used in Documentation/DocBook
 
-hostprogs-y	:= fixdep docproc
+hostprogs-y	:= fixdep
 always		:= $(hostprogs-y)
 
 # fixdep is needed to compile other host programs

scripts/gen_initramfs_list.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
 # Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org>
 #
@@ -105,9 +105,9 @@ list_parse() {
 # for links, devices etc the format differs. See gen_init_cpio for details
 parse() {
 	local location="$1"
-	local name="${location/${srcdir}//}"
+	local name="/${location#${srcdir}}"
 	# change '//' into '/'
-	name="${name//\/\///}"
+	name=$(echo "$name" | sed -e 's://*:/:g')
 	local mode="$2"
 	local uid="$3"
 	local gid="$4"
@@ -117,8 +117,8 @@ parse() {
 	[ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0
 	local str="${mode} ${uid} ${gid}"
 
-	[ "${ftype}" == "invalid" ] && return 0
+	[ "${ftype}" = "invalid" ] && return 0
-	[ "${location}" == "${srcdir}" ] && return 0
+	[ "${location}" = "${srcdir}" ] && return 0
 
 	case "${ftype}" in
 		"file")
@@ -192,7 +192,7 @@ input_file() {
 	if [ -f "$1" ]; then
 		${dep_list}header "$1"
 		is_cpio="$(echo "$1" | sed 's/^.*\.cpio\(\..*\)\?/cpio/')"
-		if [ $2 -eq 0 -a ${is_cpio} == "cpio" ]; then
+		if [ $2 -eq 0 -a ${is_cpio} = "cpio" ]; then
 			cpio_file=$1
 			echo "$1" | grep -q '^.*\.cpio\..*' && is_cpio_compressed="compressed"
 			[ ! -z ${dep_list} ] && echo "$1"
@@ -204,7 +204,7 @@ input_file() {
 		else
 		        echo "$1 \\"
 			cat "$1" | while read type dir file perm ; do
-				if [ "$type" == "file" ]; then
+				if [ "$type" = "file" ]; then
 					echo "$file \\";
 				fi
 			done
@@ -226,7 +226,7 @@ cpio_list=
 output="/dev/stdout"
 output_file=""
 is_cpio_compressed=
-compr="gzip -9 -f"
+compr="gzip -n -9 -f"
 
 arg="$1"
 case "$arg" in
@@ -240,7 +240,7 @@ case "$arg" in
 		output_file="$1"
 		cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
 		output=${cpio_list}
-		echo "$output_file" | grep -q "\.gz$" && compr="gzip -9 -f"
+		echo "$output_file" | grep -q "\.gz$" && compr="gzip -n -9 -f"
 		echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"
 		echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"
 		echo "$output_file" | grep -q "\.xz$" && \
@@ -287,8 +287,15 @@ done
 # we are careful to delete tmp files
 if [ ! -z ${output_file} ]; then
 	if [ -z ${cpio_file} ]; then
+		timestamp=
+		if test -n "$KBUILD_BUILD_TIMESTAMP"; then
+			timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
+			if test -n "$timestamp"; then
+				timestamp="-t $timestamp"
+			fi
+		fi
 		cpio_tfile="$(mktemp ${TMPDIR:-/tmp}/cpiofile.XXXXXX)"
-		usr/gen_init_cpio ${cpio_list} > ${cpio_tfile}
+		usr/gen_init_cpio $timestamp ${cpio_list} > ${cpio_tfile}
 	else
 		cpio_tfile=${cpio_file}
 	fi

scripts/kallsyms.c

@@ -500,6 +500,8 @@ static void optimize_result(void)
 
 			/* find the token with the breates profit value */
 			best = find_best_token();
+			if (token_profit[best] == 0)
+				break;
 
 			/* place it in the "best" table */
 			best_table_len[i] = 2;

scripts/mkcompile_h

@@ -42,6 +42,16 @@ if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
 else
 	TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
 fi
+if test -z "$KBUILD_BUILD_USER"; then
+	LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
+else
+	LINUX_COMPILE_BY=$KBUILD_BUILD_USER
+fi
+if test -z "$KBUILD_BUILD_HOST"; then
+	LINUX_COMPILE_HOST=`hostname`
+else
+	LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
+fi
 
 UTS_VERSION="#$VERSION"
 CONFIG_FLAGS=""
@@ -63,20 +73,8 @@ UTS_TRUNCATE="cut -b -$UTS_LEN"
 
   echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
 
-  echo \#define LINUX_COMPILE_TIME \"`date +%T`\"
+  echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
-  echo \#define LINUX_COMPILE_BY \"`whoami`\"
+  echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
-  echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
-
-  domain=`dnsdomainname 2> /dev/null`
-  if [ -z "$domain" ]; then
-    domain=`domainname 2> /dev/null`
-  fi
-
-  if [ -n "$domain" ]; then
-    echo \#define LINUX_COMPILE_DOMAIN \"`echo $domain | $UTS_TRUNCATE`\"
-  else
-    echo \#define LINUX_COMPILE_DOMAIN
-  fi
 
   echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
 ) > .tmpcompile
@@ -91,8 +89,8 @@ UTS_TRUNCATE="cut -b -$UTS_LEN"
 # first line.
 
 if [ -r $TARGET ] && \
-      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
+      grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
-      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
+      grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
       cmp -s .tmpver.1 .tmpver.2; then
    rm -f .tmpcompile
 else

usr/gen_init_cpio.c

@@ -22,6 +22,7 @@
 
 static unsigned int offset;
 static unsigned int ino = 721;
+static time_t default_mtime;
 
 struct file_handler {
 	const char *type;
@@ -102,7 +103,6 @@ static int cpio_mkslink(const char *name, const char *target,
 			 unsigned int mode, uid_t uid, gid_t gid)
 {
 	char s[256];
-	time_t mtime = time(NULL);
 
 	if (name[0] == '/')
 		name++;
@@ -114,7 +114,7 @@ static int cpio_mkslink(const char *name, const char *target,
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		1,			/* nlink */
-		(long) mtime,		/* mtime */
+		(long) default_mtime,	/* mtime */
 		(unsigned)strlen(target)+1, /* filesize */
 		3,			/* major */
 		1,			/* minor */
@@ -152,7 +152,6 @@ static int cpio_mkgeneric(const char *name, unsigned int mode,
 		       uid_t uid, gid_t gid)
 {
 	char s[256];
-	time_t mtime = time(NULL);
 
 	if (name[0] == '/')
 		name++;
@@ -164,7 +163,7 @@ static int cpio_mkgeneric(const char *name, unsigned int mode,
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		2,			/* nlink */
-		(long) mtime,		/* mtime */
+		(long) default_mtime,	/* mtime */
 		0,			/* filesize */
 		3,			/* major */
 		1,			/* minor */
@@ -242,7 +241,6 @@ static int cpio_mknod(const char *name, unsigned int mode,
 		       unsigned int maj, unsigned int min)
 {
 	char s[256];
-	time_t mtime = time(NULL);
 
 	if (dev_type == 'b')
 		mode |= S_IFBLK;
@@ -259,7 +257,7 @@ static int cpio_mknod(const char *name, unsigned int mode,
 		(long) uid,		/* uid */
 		(long) gid,		/* gid */
 		1,			/* nlink */
-		(long) mtime,		/* mtime */
+		(long) default_mtime,	/* mtime */
 		0,			/* filesize */
 		3,			/* major */
 		1,			/* minor */
@@ -460,7 +458,7 @@ static int cpio_mkfile_line(const char *line)
 static void usage(const char *prog)
 {
 	fprintf(stderr, "Usage:\n"
-		"\t%s <cpio_list>\n"
+		"\t%s [-t <timestamp>] <cpio_list>\n"
 		"\n"
 		"<cpio_list> is a file containing newline separated entries that\n"
 		"describe the files to be included in the initramfs archive:\n"
@@ -491,7 +489,11 @@ static void usage(const char *prog)
 		"nod /dev/console 0600 0 0 c 5 1\n"
 		"dir /root 0700 0 0\n"
 		"dir /sbin 0755 0 0\n"
-		"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n",
+		"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
+		"\n"
+		"<timestamp> is time in seconds since Epoch that will be used\n"
+		"as mtime for symlinks, special files and directories. The default\n"
+		"is to use the current time for these entries.\n",
 		prog);
 }
 
@@ -529,17 +531,42 @@ int main (int argc, char *argv[])
 	char *args, *type;
 	int ec = 0;
 	int line_nr = 0;
+	const char *filename;
 
-	if (2 != argc) {
+	default_mtime = time(NULL);
+	while (1) {
+		int opt = getopt(argc, argv, "t:h");
+		char *invalid;
+
+		if (opt == -1)
+			break;
+		switch (opt) {
+		case 't':
+			default_mtime = strtol(optarg, &invalid, 10);
+			if (!*optarg || *invalid) {
+				fprintf(stderr, "Invalid timestamp: %s\n",
+						optarg);
+				usage(argv[0]);
+				exit(1);
+			}
+			break;
+		case 'h':
+		case '?':
+			usage(argv[0]);
+			exit(opt == 'h' ? 0 : 1);
+		}
+	}
+
+	if (argc - optind != 1) {
 		usage(argv[0]);
 		exit(1);
 	}
-
+	filename = argv[optind];
-	if (!strcmp(argv[1], "-"))
+	if (!strcmp(filename, "-"))
 		cpio_list = stdin;
-	else if (! (cpio_list = fopen(argv[1], "r"))) {
+	else if (!(cpio_list = fopen(filename, "r"))) {
 		fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
-			argv[1], strerror(errno));
+			filename, strerror(errno));
 		usage(argv[0]);
 		exit(1);
 	}