kbuild: KERNELRELEASE is only re-defined when buiding the kernel
To avoid running setlocalversion as root no longer (re-)define KERNELRELEASE for each run. With this patch KERNELRELEASE is only re-read when we do an actual kernel build. Rationale behind this is "do as little as possible" when executing make install - as root! A new file named .kernelrelease is strored in the root of the kernel tree containing the actual version string. So when we use do a kernel build the .kernelrelease file will be updated. But in all other situations it is left as-is. To make it more visible the kernel now prints out the version being build. Sample: Building kernel 2.6.15-g63b794bf-dirty ... ... The patch also un-exports VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION since all users of these are anyway broken - and none is left in the tree. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Sam Ravnborg
parent
a9aa1ffaac
commit
cb58455c48
1 changed files with 53 additions and 42 deletions
95
Makefile
95
Makefile
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@ -141,24 +141,6 @@ VPATH := $(srctree)
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export srctree objtree VPATH TOPDIR
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nullstring :=
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space := $(nullstring) # end of line
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# Take the contents of any files called localversion* and the config
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# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
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# careful not to include files twice if building in the source
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# directory. LOCALVERSION from the command line override all of this
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localver := $(objtree)/localversion* $(srctree)/localversion*
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localver := $(sort $(wildcard $(localver)))
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# skip backup files (containing '~')
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localver := $(foreach f, $(localver), $(if $(findstring ~, $(f)),,$(f)))
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LOCALVERSION = $(subst $(space),, \
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$(shell cat /dev/null $(localver)) \
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$(patsubst "%",%,$(CONFIG_LOCALVERSION)))
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KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(LOCALVERSION)
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# SUBARCH tells the usermode build what the underlying arch is. That is set
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# first, and if a usermode build is happening, the "ARCH=um" on the command
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@ -353,7 +335,10 @@ CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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-ffreestanding
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AFLAGS := -D__ASSEMBLY__
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export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
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# Read KERNELRELEASE from .kernelrelease (if it exists)
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KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
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export KERNELRELEASE \
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ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
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CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
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HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
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@ -551,26 +536,6 @@ export KBUILD_IMAGE ?= vmlinux
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# images. Default is /boot, but you can set it to other values
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export INSTALL_PATH ?= /boot
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# If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests
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# and try to determine if the current source tree is a release tree, of any sort,
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# or if is a pure development tree.
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#
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# A 'release tree' is any tree with a git TAG associated
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# with it. The primary goal of this is to make it safe for a native
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# git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to
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# continue developing against the current Linus tree, without having the Linus
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# tree overwrite the 2.6.9 tree when installed.
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#
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# Currently, only git is supported.
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# Other SCMs can edit scripts/setlocalversion and add the appropriate
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# checks as needed.
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ifdef CONFIG_LOCALVERSION_AUTO
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localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
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LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
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endif
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#
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# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
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# relocations required by build roots. This is not defined in the
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@ -782,6 +747,50 @@ $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
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$(vmlinux-dirs): prepare scripts
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$(Q)$(MAKE) $(build)=$@
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# Build the kernel release string
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# The KERNELRELEASE is stored in a file named .kernelrelease
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# to be used when executing for example make install or make modules_install
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#
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# Take the contents of any files called localversion* and the config
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# variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
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# LOCALVERSION from the command line override all of this
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nullstring :=
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space := $(nullstring) # end of line
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___localver = $(objtree)/localversion* $(srctree)/localversion*
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__localver = $(sort $(wildcard $(___localver)))
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# skip backup files (containing '~')
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_localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
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localver = $(subst $(space),, \
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$(shell cat /dev/null $(_localver)) \
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$(patsubst "%",%,$(CONFIG_LOCALVERSION)))
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# If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
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# and if the SCM is know a tag from the SCM is appended.
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# The appended tag is determinded by the SCM used.
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#
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# Currently, only git is supported.
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# Other SCMs can edit scripts/setlocalversion and add the appropriate
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# checks as needed.
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ifdef CONFIG_LOCALVERSION_AUTO
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_localver-auto = $(shell $(CONFIG_SHELL) \
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$(srctree)/scripts/setlocalversion $(srctree))
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localver-auto = $(LOCALVERSION)$(_localver-auto)
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endif
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localver-full = $(localver)$(localver-auto)
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# Store (new) KERNELRELASE string in .kernelrelease
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kernelrelease = \
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$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)$(localver-full)
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.kernelrelease: FORCE
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$(Q)rm -f .kernelrelease
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$(Q)echo $(kernelrelease) > .kernelrelease
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$(Q)echo " Building kernel $(kernelrelease)"
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# Things we need to do before we recursively start building the kernel
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# or the modules are listed in "prepare".
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# A multi level approach is used. prepareN is processed before prepareN-1.
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@ -798,8 +807,7 @@ $(vmlinux-dirs): prepare scripts
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# and if so do:
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# 1) Check that make has not been executed in the kernel src $(srctree)
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# 2) Create the include2 directory, used for the second asm symlink
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prepare3:
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prepare3: .kernelrelease
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ifneq ($(KBUILD_SRC),)
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@echo ' Using $(srctree) as source for kernel'
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$(Q)if [ -f $(srctree)/.config ]; then \
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@ -986,7 +994,7 @@ CLEAN_FILES += vmlinux System.map \
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MRPROPER_DIRS += include/config include2
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MRPROPER_FILES += .config .config.old include/asm .version .old_version \
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include/linux/autoconf.h include/linux/version.h \
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Module.symvers tags TAGS cscope*
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.kernelrelease Module.symvers tags TAGS cscope*
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# clean - Delete most, but leave enough to build external modules
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#
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@ -1072,6 +1080,7 @@ help:
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@echo ' tags/TAGS - Generate tags file for editors'
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@echo ' cscope - Generate cscope index'
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@echo ' kernelrelease - Output the release version string'
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@echo ' kernelversion - Output the version stored in Makefile'
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@echo ''
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@echo 'Static analysers'
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@echo ' buildcheck - List dangling references to vmlinux discarded sections'
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@ -1293,6 +1302,8 @@ checkstack:
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kernelrelease:
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@echo $(KERNELRELEASE)
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kernelversion:
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@echo $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
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# FIXME Should go into a make.lib or something
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# ===========================================================================
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