linux-kernel - Re: [PATCH] Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL

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Date:	Tue, 24 Nov 2015 11:42:09 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Michal Marek <mmarek@...e.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] Kbuild: disable 'maybe-uninitialized' warning for CONFIG_PROFILE_ALL_BRANCHES

On Tuesday 24 November 2015 11:20:43 Michal Marek wrote:
> > diff --git a/Makefile b/Makefile
> > index 5e01a416c6e4..f8b921658f29 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -626,7 +626,11 @@ KBUILD_CFLAGS    += $(call cc-option,-fno-delete-null-pointer-checks,)
> >  ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
> >  KBUILD_CFLAGS        += -Os $(call cc-disable-warning,maybe-uninitialized,)
> >  else
> > -KBUILD_CFLAGS        += -O2
> > +ifdef CONFIG_PROFILE_ALL_BRANCHES
> > +KBUILD_CFLAGS        += -O2 $(call cc-disable-warning,maybe-uninitialized,)
> > +else
> > +KBUILD_CFLAGS   += -O2
> > +endif
> 
> Does it only happen with -O2? Normally, we would add it outside the
> ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE.
> 

We already disable the warning for -Os builds based on a patch we merged
a while ago. It seems easier to add it to the block we already have.

	Arnd
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