linux-kernel - Re: [PATCH -tip ] [BUGFIX] kprobes: Move hash

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Date:	Wed, 13 Mar 2013 22:46:49 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Timo Juhani Lindfors <timo.lindfors@....fi>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	yrl.pp-manager.tt@...achi.com,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH -tip ] [BUGFIX] kprobes: Move hash_64() into .text.kprobe
 section

(2013/03/13 22:28), Timo Juhani Lindfors wrote:
> Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> writes:
>> OK, then I'll update it to just use __always_inline.
> 
> I get a similar case of infinite recursion if I try to kprobe
> "inat_get_opcode_attribute":

Oops, right! And this is caused by below callchain
set_current_kprobes->is_IF_modifier->skip_prefixes
->inat_get_opcode_attribute
However, this looks very wired that the copied instruction
(ainsn->insn) is analyzed at every probe hit.
I think we should add a bit flag indicating IF modifier
to the ainsn.

Thank you for reporting!!

-- 
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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