From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f44.google.com (mail-pa0-f44.google.com [209.85.220.44]) by kanga.kvack.org (Postfix) with ESMTP id E7CFC6B0035 for ; Thu, 11 Sep 2014 18:32:44 -0400 (EDT) Received: by mail-pa0-f44.google.com with SMTP id kx10so10873872pab.3 for ; Thu, 11 Sep 2014 15:32:44 -0700 (PDT) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTP id of4si4287474pbc.79.2014.09.11.15.32.43 for ; Thu, 11 Sep 2014 15:32:43 -0700 (PDT) Message-ID: <5412230A.6090805@intel.com> Date: Thu, 11 Sep 2014 15:32:42 -0700 From: Dave Hansen MIME-Version: 1.0 Subject: Re: [PATCH v8 07/10] x86, mpx: decode MPX instruction to get bound violation information References: <1410425210-24789-1-git-send-email-qiaowei.ren@intel.com> <1410425210-24789-8-git-send-email-qiaowei.ren@intel.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Thomas Gleixner , Qiaowei Ren Cc: "H. Peter Anvin" , Ingo Molnar , x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org On 09/11/2014 03:18 PM, Thomas Gleixner wrote: > On Thu, 11 Sep 2014, Qiaowei Ren wrote: >> This patch sets bound violation fields of siginfo struct in #BR >> exception handler by decoding the user instruction and constructing >> the faulting pointer. >> >> This patch does't use the generic decoder, and implements a limited >> special-purpose decoder to decode MPX instructions, simply because the >> generic decoder is very heavyweight not just in terms of performance >> but in terms of interface -- because it has to. > > And why is that an argument to add another special purpose decoder? Peter asked for it to be done this way specifically: https://lkml.org/lkml/2014/6/19/411 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org