linux-kernel - Re: [PATCH] sched: fix user time incorrectly accounted as system time on 32 bit

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Message-ID: <20100914142930.GA8415@redhat.com>
Date:	Tue, 14 Sep 2010 16:29:31 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] sched: fix user time incorrectly accounted as system
 time on 32 bit

On Tue, Sep 14, 2010 at 03:44:52PM +0200, Stanislaw Gruszka wrote:
> We have 32 bit variable overflow possibility when multiply in
> task_times() and thread_group_times() functions. If overflow happens
> calculated scaled utime value become wrongly small and scaled stime
> wrongly big.
> 
> Reported here:
> https://bugzilla.redhat.com/show_bug.cgi?id=633037
> https://bugzilla.kernel.org/show_bug.cgi?id=16559
> 
> Reported-by: Michael Chapman <redhat-bugzilla@...y.puzzling.org>
> Reported-by: Ciriaco Garcia de Celis <sysman@...erpilot.com>
> Cc: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: stable@...nel.org  # 2.6.32.19+ (partially), 2.6.33+

Seems my send-email script screwed recipients, I will repost.

Stanislaw
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