linux-kernel - Re: sched: Disallow sched_attr::sched

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Message-ID: <20140603131609.GA26267@redhat.com>
Date:	Tue, 3 Jun 2014 09:16:09 -0400
From:	Dave Jones <davej@...hat.com>
To:	Richard Weinberger <richard@....at>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Kerrisk-manpages <mtk.manpages@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: sched: Disallow sched_attr::sched_policy < 0

On Tue, Jun 03, 2014 at 10:47:18AM +0200, Richard Weinberger wrote:
 > Am 03.06.2014 10:32, schrieb Peter Zijlstra:
 > > On Tue, Jun 03, 2014 at 10:15:44AM +0200, Richard Weinberger wrote:
 > >>> Once upon a time GCC also did warns like that, but my compiler is silent
 > >>> :-(
 > 
 > -Wtype-limits is what you're looking for.
 > 
 > /me currently builds some kernel configs to find out how much noise it triggers...
 
Probably quite a bit I'd bet. There's a load of similar bugs in
coverity's db. Some of them look benign, and are probably there just in
case someone ever changes the type of a var, but it's non-obvious
sometimes if the values a function receives can ever actually be < 0

	Dave

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