linux-kernel - Re: [PATCH] futex null pointer timeout

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Message-ID: <20070118073816.GA28486@elte.hu>
Date:	Thu, 18 Jan 2007 08:38:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	tglx@...utronix.de, khilman@...sta.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] futex null pointer timeout


* Daniel Walker <dwalker@...sta.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
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