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From: Ingo Molnar <mingo@elte.hu>
To: Daniel Walker <dwalker@mvista.com>
Cc: tglx@linutronix.de, khilman@mvista.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] futex null pointer timeout
Date: Thu, 18 Jan 2007 08:38:16 +0100	[thread overview]
Message-ID: <20070118073816.GA28486@elte.hu> (raw)
In-Reply-To: <20070118002503.418478415@mvista.com>


* Daniel Walker <dwalker@mvista.com> wrote:

> This fix is mostly from Thomas ..
> 
> The problem was that a futex can be called with a zero timeout (0 
> seconds, 0 nanoseconds) and it's a valid expired timeout. However, the 
> current futex in -rt assumes a zero timeout is an infinite timeout.
> 
> Kevin Hilman found this using LTP's nptl01 test case which would soft 
> hang occasionally.
> 
> The patch reworks do_futex, and futex_wait* so a NULL pointer in the 
> timeout position is infinite, and anything else is evaluated as a real 
> timeout.

thanks, applied.

	Ingo

  parent reply	other threads:[~2007-01-18  7:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-18  0:25 [PATCH] futex null pointer timeout Daniel Walker
2007-01-18  6:51 ` Thomas Gleixner
2007-01-18  7:38 ` Ingo Molnar [this message]
2007-01-18 12:26   ` Pierre Peiffer
2007-01-18 12:44     ` Daniel Walker
2007-01-18 13:07     ` Ingo Molnar

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