linux-kernel - Re: [GIT PULL] scheduler fix

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Message-ID: <20100408185216.GA28689@elte.hu>
Date:	Thu, 8 Apr 2010 20:52:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andreas Schwab <schwab@...hat.com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@...ba.org>
Subject: Re: [GIT PULL] scheduler fix


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Thu, 8 Apr 2010, Ingo Molnar wrote:
> > 
> > So i'd suggest changing nr_cpu_ids to unsigned int [unless there's some strong 
> > reason to have it signed] plus doing something like:
> > 
> > 	if (len < (nr_cpu_ids >> BITS_PER_BYTE_BITS))
> 
> No workee.
> 
> It really should round up.

Indeed.

> If you worry about code generation, I'd suggest looking at whether 
> nr_cpu_ids could just be made unsigned.
> 
> Anyway, this all was _not_ the point of my original email. I really don't 
> care about this particular instance. I care more about the whole "in general 
> people should think _way_ more about validating user-supplied arguments than 
> clearly happened this time".

Yeah, no argument about that, point taken and accepted.

	Ingo
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