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SubjectRe: [PATCH] kernel: prevent unnecessary rebuilding due to config_data.gz
On Tue, 05 Jul 2011 19:42:18 -0400 (EDT) Peter Foley wrote:

> 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@verizon.net>

Michal,
If this looks OK to you, please merge it.

Thanks.

> ---
> kernel/Makefile | 5 ++---
> 1 files changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/Makefile b/kernel/Makefile
> index 2d64cfc..d06467f 100644
> --- a/kernel/Makefile
> +++ b/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
>
> --


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***


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