linux-kernel - Re: [PATCH -tip v8 02/26] kprobes/x86: Allow to handle reentered kprobe on singlestepping

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Date:	Mon, 24 Mar 2014 19:07:09 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	fche@...hat.com, mingo@...hat.com, systemtap@...rceware.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH -tip v8 02/26] kprobes/x86: Allow to handle reentered
 kprobe on singlestepping

(2014/03/22 6:44), Steven Rostedt wrote:
> On Wed, 05 Mar 2014 20:58:57 +0900
> Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> 
>> Since the NMI handlers(e.g. perf) can interrupt in the
>> single stepping (or preparing the single stepping, do_debug
>> etc.), we should consider a kprobe is hit in the NMI
>> handler. Even in that case, the kprobe is allowed to be
>> reentered as same as the kprobes hit in kprobe handlers
>> (KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE).
>> The real issue will happen when a kprobe hit while another
>> reentered kprobe is processing (KPROBE_REENTER), because
>> we already consumed a saved-area for the previous kprobe.
>>
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: "H. Peter Anvin" <hpa@...or.com>
> 
> Reviewed-by: Steven Rostedt <rostedt@...dmis.org>
> 

Thanks! :)


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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