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

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Message-ID: <1276585067.2552.101.camel@pasglop>
Date:	Tue, 15 Jun 2010 16:57:47 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul Mackerras <paulus@...ba.org>, tytso@....edu,
	Salman <sqazi@...gle.com>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	tytso@...gle.com, torvalds@...ux-foundation.org, walken@...gle.com,
	Chen Liqin <liqin.chen@...plusct.com>,
	Lennox Wu <lennox.wu@...il.com>
Subject: Re: [PATCH] Fix a race in pid generation that causes pids to be
 reused immediately.

On Mon, 2010-06-14 at 21:21 -0700, Andrew Morton wrote:
> If that happens then the best fix is for those architectures to get
> themselves a cmpxchg64().  Unless for some reason it's simply
> unimplementable?  Worst case I guess one could use a global spinlock. 
> Second-worst-case: hashed spinlocks. 

Right, ppc32 at least can't so that would be spinlocks...

Cheers,
Ben.

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