linux-kernel - Re: linux-next: build warning after merge of the tip tree

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Message-ID: <53C97287.5020509@zytor.com>
Date:	Fri, 18 Jul 2014 12:16:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
CC:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: linux-next: build warning after merge of the tip tree

On 07/17/2014 10:00 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the tip tree, today's linux-next build (x86_64
> allmodconfig) produced these warnings:
> 
> In file included from arch/x86/vdso/vdso2c.c:161:0: 
> arch/x86/vdso/vdso2c.c: In function 'main': 
> arch/x86/vdso/vdso2c.h:118:6: warning: assuming signed overflow
> does not occur when assuming that (X + c) < X is always false
> [-Wstrict-overflow] In file included from
> arch/x86/vdso/vdso2c.c:165:0: arch/x86/vdso/vdso2c.h:118:6:
> warning: assuming signed overflow does not occur when assuming that
> (X + c) < X is always false [-Wstrict-overflow]
> 
> Probably introduced by commit e6577a7ce99a ("x86, vdso: Move the
> vvar area before the vdso text").
> 

This seems toxic.

I always wonder if we shouldn't use -fwrapv for the kernel...

	-hpa

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