linux-kernel - Re: [PATCH -tip v8 17/26] notifier: Use NOKPROBE

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Date:	Tue, 25 Mar 2014 19:23:58 +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 17/26] notifier: Use NOKPROBE_SYMBOL macro in
 notifier

(2014/03/25 5:12), Steven Rostedt wrote:
> On Wed, 05 Mar 2014 21:00:42 +0900
> Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:
> 
>> Use NOKPROBE_SYMBOL macro to protect functions from
>> kprobes instead of __kprobes annotation in notifier.
>>
>> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
>>  /*
>>   *	Blocking notifier chain routines.  All access to the chain is
>> @@ -527,7 +530,7 @@ EXPORT_SYMBOL_GPL(srcu_init_notifier_head);
>>  
>>  static ATOMIC_NOTIFIER_HEAD(die_chain);
>>  
>> -int notrace __kprobes notify_die(enum die_val val, const char *str,
>> +int notrace notify_die(enum die_val val, const char *str,
> 
> Hmm, I wonder why notify_die() is marked notrace? But that's unrelated
> to this patch.
> 
> Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

Thanks! I guess since notify_die() is called from any kind of fault,
which may be happen inside ftrace too.

Thank you,

-- 
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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