linux-kernel - Re: ftrace/perf

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Message-ID: <4C7E1C36.6070400@redhat.com>
Date:	Wed, 01 Sep 2010 12:26:14 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	kvm-devel <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ftrace/perf_event leak

  On 09/01/2010 12:04 PM, Peter Zijlstra wrote:
>
> Does something like the below cure that?
>

Unfortunately not.

> I seem to remember C doesn't make any promises about the order of logic
> statements, hence we need to explicitly pull out that try_module_get()
> so that it evaluates after the rest of the conditions.

&& and || are executed in order (so you can write

    if (p && p->x)

).

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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