linux-kernel - Re: [PATCH v10 3.3-rc2 1/9] uprobes: Install and remove breakpoints.

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Message-ID: <20120209082722.GD16600@linux.vnet.ibm.com>
Date:	Thu, 9 Feb 2012 13:57:22 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH v10 3.3-rc2 1/9] uprobes: Install and remove
 breakpoints.

> >>
> > 
> > I am confused by why we need to call insn_get_length(insn) before
> > checking insn->rex_prefix.nbytes? Is it needed.
> 
> Ah, certainly, no, if the insn is already decoded.

Okay, 

> > 
> > 	uprobe->arch_info.rip_rela_target_address = 0x0;
> > 	if (!insn_rip_relative(insn))
> > 		return;
> 
> Here, I think it is better to add a comment that
> insn_rip_relative() decodes until modrm. :)

Will do.

> 
> > 	return;
> > }
> 
> Confirmed, this looks good to me ;)
> 
> Thanks!

Okay, Thanks for confirming, 

Do you have a handy instruction whose REX.B is set that I could use to test.

-- 
Thanks and Regards
Srikar

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