linux-kernel - Re: [PATCH 2/6] uprobes: introduce is_swbp_at_addr

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Message-ID: <1334692418.28150.88.camel@twins>
Date:	Tue, 17 Apr 2012 21:53:38 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anton Arapov <anton@...hat.com>
Subject: Re: [PATCH 2/6] uprobes: introduce is_swbp_at_addr_fast()

On Tue, 2012-04-17 at 19:09 +0200, Oleg Nesterov wrote:
> 
> This reminds me. Why read_opcode() does lock_page? I was going
> to send the cleanup which removes it, but I need to recheck.
> 
> Perhaps you can explain the reason? 

I can't seem to recall, I suspect its to serialize against
__replace_page(). I can't say if that's strictly needed though.
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