linux-kernel - Re: Re: [RFC PATCH 4/6] uprobes/x86: Emulate rip-relative call's

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Message-ID: <CAK1hOcNM-kDF3QHWLJCAuVi0xM0Cf3OUixowyrEp_JN=L6yS2w@mail.gmail.com>
Date:	Mon, 14 Apr 2014 14:24:35 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <aarapov@...hat.com>,
	David Long <dave.long@...aro.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jonathan Lebon <jlebon@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Re: [RFC PATCH 4/6] uprobes/x86: Emulate rip-relative call's

On Mon, Apr 14, 2014 at 7:14 AM, Masami Hiramatsu
<masami.hiramatsu.pt@...achi.com> wrote:
>> You can check whether insn had any prefix by checking
>> insn->prefixes->nbytes != 0...
>
> No, since there are other prefixes (and it may be meaningless)
> you should find 0x66 in insn->prefixes->bytes[].

What "no"? Is my statement not true? Please reread it.
I'm not talking about checking for 0x66 prefix.
Here, I am talking about checking that insn has *any* prefix.
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