kbuild: introduce utsrelease.h

include/linux/version.h contained both actual KERNEL version
and UTS_RELEASE that contains a subset from git SHA1 for when
kernel was compiled as part of a git repository.
This had the unfortunate side-effect that all files including version.h
would be recompiled when some git changes was made due to changes SHA1.
Split it out so we keep independent parts in separate files.

Also update checkversion.pl script to no longer check for UTS_RELEASE.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

14 files changed, 33 insertions, 27 deletions

diff --git a/Makefile b/Makefile
index 1cc793ff42d4..b36aeb617bd2 100644
--- a/Makefile
+++ b/Makefile
@@ -812,8 +812,8 @@ endif
 # prepare2 creates a makefile if using a separate output directory
 prepare2: prepare3 outputmakefile
 
-prepare1: prepare2 include/linux/version.h include/asm \
-                   include/config/auto.conf
+prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
+                   include/asm include/config/auto.conf
 ifneq ($(KBUILD_MODULES),)
         $(Q)mkdir -p $(MODVERDIR)
         $(Q)rm -f $(MODVERDIR)/*
@@ -848,21 +848,26 @@ include/asm:
 # 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
-        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)\"; \
-          echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
-         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
-        )
+        (echo \#define LINUX_VERSION_CODE $(shell                             \
+        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
+        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
 endef
 
-include/linux/version.h: $(srctree)/Makefile include/config/kernel.release FORCE
+include/linux/version.h: $(srctree)/Makefile FORCE
         $(call filechk,version.h)
 
+include/linux/utsrelease.h: include/config/kernel.release FORCE
+        $(call filechk,utsrelease.h)
+
 # ---------------------------------------------------------------------------
 
 PHONY += depend dep
@@ -955,7 +960,8 @@ CLEAN_FILES +=	vmlinux System.map \
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include2
 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
-                  include/linux/autoconf.h include/linux/version.h \
+                  include/linux/autoconf.h include/linux/version.h      \
+                  include/linux/utsrelease.h                            \
                   Module.symvers tags TAGS cscope*
 
 # clean - Delete most, but leave enough to build external modules
diff --git a/arch/alpha/boot/bootp.c b/arch/alpha/boot/bootp.c
index ec53c28e33de..3af21c789339 100644
--- a/arch/alpha/boot/bootp.c
+++ b/arch/alpha/boot/bootp.c
@@ -9,7 +9,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/string.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/mm.h>
 
 #include <asm/system.h>
diff --git a/arch/alpha/boot/bootpz.c b/arch/alpha/boot/bootpz.c
index a6657f2cf9bd..4307bde80a35 100644
--- a/arch/alpha/boot/bootpz.c
+++ b/arch/alpha/boot/bootpz.c
@@ -11,7 +11,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/string.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/mm.h>
 
 #include <asm/system.h>
diff --git a/arch/alpha/boot/main.c b/arch/alpha/boot/main.c
index 78c9b0b6eea7..90ed55b662a8 100644
--- a/arch/alpha/boot/main.c
+++ b/arch/alpha/boot/main.c
@@ -7,7 +7,7 @@
  */
 #include <linux/kernel.h>
 #include <linux/string.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/mm.h>
 
 #include <asm/system.h>
diff --git a/arch/frv/kernel/setup.c b/arch/frv/kernel/setup.c
index 5db3d4eff909..af08ccd4ed6e 100644
--- a/arch/frv/kernel/setup.c
+++ b/arch/frv/kernel/setup.c
@@ -10,7 +10,7 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
diff --git a/arch/i386/boot/setup.S b/arch/i386/boot/setup.S
index 0a5a3be6d69c..d2b684cd620a 100644
--- a/arch/i386/boot/setup.S
+++ b/arch/i386/boot/setup.S
@@ -47,7 +47,7 @@
  */
 
 #include <asm/segment.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/compile.h>
 #include <asm/boot.h>
 #include <asm/e820.h>
diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index 1f1771b212b4..9df9f2079e9b 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -24,7 +24,7 @@
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/pci.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/adb.h>
 #include <linux/module.h>
 #include <linux/delay.h>
diff --git a/arch/powerpc/platforms/powermac/bootx_init.c b/arch/powerpc/platforms/powermac/bootx_init.c
index cb257aeb91f6..24f09e2a5775 100644
--- a/arch/powerpc/platforms/powermac/bootx_init.c
+++ b/arch/powerpc/platforms/powermac/bootx_init.c
@@ -12,7 +12,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/init.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <asm/sections.h>
 #include <asm/prom.h>
 #include <asm/page.h>
diff --git a/arch/ppc/syslib/btext.c b/arch/ppc/syslib/btext.c
index 51ab6e90fe25..d11667046f21 100644
--- a/arch/ppc/syslib/btext.c
+++ b/arch/ppc/syslib/btext.c
@@ -6,7 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/init.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 
 #include <asm/sections.h>
 #include <asm/bootx.h>
diff --git a/arch/x86_64/boot/setup.S b/arch/x86_64/boot/setup.S
index 7de8b8fd1685..a50b631f4d2b 100644
--- a/arch/x86_64/boot/setup.S
+++ b/arch/x86_64/boot/setup.S
@@ -46,7 +46,7 @@
  */
 
 #include <asm/segment.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/compile.h>
 #include <asm/boot.h>
 #include <asm/e820.h>
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_ethtool.c b/drivers/net/wireless/bcm43xx/bcm43xx_ethtool.c
index b3ffcf501311..e386dcc32e8c 100644
--- a/drivers/net/wireless/bcm43xx/bcm43xx_ethtool.c
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_ethtool.c
@@ -32,7 +32,7 @@
 #include <linux/netdevice.h>
 #include <linux/pci.h>
 #include <linux/string.h>
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 
 
 static void bcm43xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
diff --git a/include/linux/vermagic.h b/include/linux/vermagic.h
index dc7c621e4647..46919f9f5eb3 100644
--- a/include/linux/vermagic.h
+++ b/include/linux/vermagic.h
@@ -1,4 +1,4 @@
-#include <linux/version.h>
+#include <linux/utsrelease.h>
 #include <linux/module.h>
 
 /* Simply sanity version stamp for modules. */
diff --git a/init/version.c b/init/version.c
index 3ddc3ceec2fe..e290802c6bd2 100644
--- a/init/version.c
+++ b/init/version.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/uts.h>
 #include <linux/utsname.h>
+#include <linux/utsrelease.h>
 #include <linux/version.h>
 
 #define version(a) Version_ ## a
diff --git a/scripts/checkversion.pl b/scripts/checkversion.pl
index 9f84e562318d..ec7d21161bdc 100755
--- a/scripts/checkversion.pl
+++ b/scripts/checkversion.pl
@@ -1,7 +1,7 @@
 #! /usr/bin/perl
 #
-# checkversion find uses of LINUX_VERSION_CODE, KERNEL_VERSION, or
-# UTS_RELEASE without including <linux/version.h>, or cases of
+# checkversion find uses of LINUX_VERSION_CODE or KERNEL_VERSION
+# without including <linux/version.h>, or cases of
 # including <linux/version.h> that don't need it.
 # Copyright (C) 2003, Randy Dunlap <rdunlap@xenotime.net>
 
@@ -41,8 +41,7 @@ foreach $file (@ARGV)
         }
 
         # Look for uses: LINUX_VERSION_CODE, KERNEL_VERSION, UTS_RELEASE
-        if (($_ =~ /LINUX_VERSION_CODE/) || ($_ =~ /\WKERNEL_VERSION/) ||
-                ($_ =~ /UTS_RELEASE/)) {
+        if (($_ =~ /LINUX_VERSION_CODE/) || ($_ =~ /\WKERNEL_VERSION/)) {
             $fUseVersion = 1;
             last LINE if $iLinuxVersion;
         }