linux-kernel - Re: [PATCH v4 3.0-rc2-tip 2/22] 2: uprobes: Breakground page replacement.

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Message-ID: <20110614145706.GD4952@linux.vnet.ibm.com>
Date:	Tue, 14 Jun 2011 20:27:06 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 2/22]  2: uprobes: Breakground page
 replacement.

> > 
> > /*
> >  * NOTE:
> >  * Expect the breakpoint instruction to be the smallest size instruction for
> >  * the architecture. If an arch has variable length instruction and the
> >  * breakpoint instruction is not of the smallest length instruction
> >  * supported by that architecture then we need to modify read_opcode /
> >  * write_opcode accordingly. This would never be a problem for archs that
> >  * have fixed length instructions.
> >  */
> 
> Whoever reads comments anyway? :-)
> 
> > Do we have archs which have a breakpoint instruction which isnt of the
> > smallest instruction size for that arch. If we do have can we change the
> > write_opcode/read_opcode while we support that architecture?
> 
> Why not put a simple WARN_ON_ONCE() in there that checks the assumption?

Okay, will do.

-- 
Thanks and Regards
Srikar
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