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

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Date:	Tue, 24 Nov 2015 11:20:43 +0100
From:	Michal Marek <mmarek@...e.com>
To:	Arnd Bergmann <arnd@...db.de>
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 2015-11-23 17:26, Arnd Bergmann wrote:
> These are all false positives that either rob someone's time when trying
> to figure out whether they are real, or they get people to send wrong
> patches to shut up the warnings.
[...]
> 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.

Michal
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