linux-kernel - Re: [tip:x86/build] x86/build: Remove -Wno-sign-compare

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Message-ID: <20150512085303.GA9090@gmail.com>
Date:	Tue, 12 May 2015 10:53:03 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Waiman Long <Waiman.Long@...com>
Cc:	Peter Anvin <hpa@...or.com>, Brian Gerst <brgerst@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	Louis Langholtz <lou_langholtz@...com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [tip:x86/build] x86/build: Remove -Wno-sign-compare


* Ingo Molnar <mingo@...nel.org> wrote:

> Here's the full list of warnings for allmod64:
> 
> make bzImage:
> 
>  include/linux/blkdev.h:624:26: warning: switch condition has boolean value [-Wswitch-bool]
>  ./arch/x86/include/asm/qspinlock.h:28:2: warning: implicit declaration of function ?pv_queued_spin_lock_slowpath? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:33:2: warning: implicit declaration of function ?pv_queued_spin_unlock? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:28:2: warning: implicit declaration of function ?pv_queued_spin_lock_slowpath? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:33:2: warning: implicit declaration of function ?pv_queued_spin_unlock? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:28:2: warning: implicit declaration of function ?pv_queued_spin_lock_slowpath? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:33:2: warning: implicit declaration of function ?pv_queued_spin_unlock? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:28:2: warning: implicit declaration of function ?pv_queued_spin_lock_slowpath? [-Wimplicit-function-declaration]
>  ./arch/x86/include/asm/qspinlock.h:33:2: warning: implicit declaration of function ?pv_queued_spin_unlock? [-Wimplicit-function-declaration]

And that comes from tip:locking/core, but those warnings do not show 
up with GCC 4.9.2: so it's either a GCC 5.0.1 bug, or we missed 
something with the WIP queued pv spinlocks changes that newer GCC is 
able to notice.

Thanks,

	Ingo
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