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SubjectRe: [PATCH] kernel: prevent unnecessary rebuilding due to config_data.gz
On Wed, 6 Jul 2011, Randy Dunlap wrote:

> 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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