linux-kernel - Re: stable: please queue commit 0231bb5 ("perf: Fix event group context move")

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Date:	Mon, 5 Aug 2013 10:21:18 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>
Subject: Re: stable: please queue commit 0231bb5 ("perf: Fix event group
 context move")


* Li Zefan <lizefan@...wei.com> wrote:

> Plese consider adding commit 0231bb5336758426b44ccd798ccd3c5419c95d58
> to stable tree. It fixes a real bug, which was explained here:
> 
> 	http://thread.gmane.org/gmane.linux.kernel.perf.user/1144
> 
> and I've managed to reproduce the bug in 3.4 kernel with the test
> program attached in the above email, and I've confirmed the bug fix.
> 
> The effect of the bug is, if we open a group of mixed events(sw/hw)
> and the "disabled" flag is not set and sw events come first, then
> some of the perf events won't be started after the call to perf_event_open().
> 
> The bug fix should be applicable to kernels >= 3.0 && <= 3.7.

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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