linux-kernel - Re: [PATCH 2/2] kprobe: remove preempt_enable/disable from kprobe_handle

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Date:	Wed, 09 Jan 2008 22:15:42 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
CC:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	David Miller <davem@...emloft.net>, hskinnemoen@...el.com,
	schwidefsky@...ibm.com, tony.luck@...el.com,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	David Wilder <dwilder@...ibm.com>, jkenisto@...ibm.com
Subject: Re: [PATCH 2/2] kprobe: remove preempt_enable/disable from	kprobe_handle_fault()

Harvey Harrison wrote:
> This patch removes the preempt_disable/enable pair around kprobe_running
> which was originally added to avoid the assertion from smp_processor_id
> which would be hit an asertion if preemption was enabled.
> 
> Kprobes can not be running if we are preemptible, so test explicitly
> for preemption and bail out before hitting kprobe_running().
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>

Tested on x86-64.

Acked-by: Masami Hiramatsu <mhiramat@...hat.com>

Thank you!

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com, masami.hiramatsu.pt@...achi.com

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