The patch titled
kernel/Makefile: prevent unnecessary rebuilding due to config_data.gz
has been added to the -mm tree. Its filename is
kernel-makefile-prevent-unnecessary-rebuilding-due-to-config_datagz.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
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Subject: kernel/Makefile: prevent unnecessary rebuilding due to config_data.gz
From: Peter Foley <pefoley2@xxxxxxxxxxx>
When IKCONFIG is built-in, make oldconfig will cause the kernel to be
relinked even if .config didn't change. This happens because of a
config_data.gz dependency on .config. This patch changes the if_changed
to a filechk so that config_data.h is only rebuilt when the contents have
actually changed.
Signed-off-by: Peter Foley <pefoley2@xxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/Makefile | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff -puN kernel/Makefile~kernel-makefile-prevent-unnecessary-rebuilding-due-to-config_datagz kernel/Makefile
--- a/kernel/Makefile~kernel-makefile-prevent-unnecessary-rebuilding-due-to-config_datagz
+++ a/kernel/Makefile
@@ -125,11 +125,10 @@ targets += config_data.gz
$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
$(call if_changed,gzip)
-quiet_cmd_ikconfiggz = IKCFG $@
- cmd_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@
+ filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;")
targets += config_data.h
$(obj)/config_data.h: $(obj)/config_data.gz FORCE
- $(call if_changed,ikconfiggz)
+ $(call filechk,ikconfiggz)
$(obj)/time.o: $(obj)/timeconst.h
_
Patches currently in -mm which might be from pefoley2@xxxxxxxxxxx are
kernel-makefile-prevent-unnecessary-rebuilding-due-to-config_datagz.patch
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