linux-kernel - Re: [PATCH] Fix a race in pid generation that causes pids to be reused immediately.

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Message-ID: <alpine.LFD.2.00.1006091517450.4506@i5.linux-foundation.org>
Date:	Wed, 9 Jun 2010 15:20:36 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Salman <sqazi@...gle.com>, akpm@...ux-foundation.org,
	mingo@...e.hu, linux-kernel@...r.kernel.org, tytso@...gle.com
Subject: Re: [PATCH] Fix a race in pid generation that causes pids to be
 reused immediately.



On Wed, 9 Jun 2010, Peter Zijlstra wrote:
> 
> Isn't: return a - base < b - base, the natural way to express this?

Quite possibly. I'd worry about the overflow case a bit, but it's 
certainly going to get the right value when base << MAX_INT.

		Linus
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