From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753230AbdFPKdj (ORCPT ); Fri, 16 Jun 2017 06:33:39 -0400 Received: from gate.crashing.org ([63.228.1.57]:51103 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752589AbdFPKdi (ORCPT ); Fri, 16 Jun 2017 06:33:38 -0400 Message-ID: <1497609181.2897.100.camel@kernel.crashing.org> Subject: Re: [RFC PATCH 7/7 v1]powerpc: Deliver SEGV signal on protection key violation. From: Benjamin Herrenschmidt To: Anshuman Khandual , Ram Pai , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: dave.hansen@intel.com, paulus@samba.org, aneesh.kumar@linux.vnet.ibm.com Date: Fri, 16 Jun 2017 20:33:01 +1000 In-Reply-To: <622d7abf-3d99-8897-5afb-ef8c4f950fc0@linux.vnet.ibm.com> References: <1496711109-4968-1-git-send-email-linuxram@us.ibm.com> <1496711109-4968-8-git-send-email-linuxram@us.ibm.com> <622d7abf-3d99-8897-5afb-ef8c4f950fc0@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-2.fc25) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2017-06-16 at 14:50 +0530, Anshuman Khandual wrote: > On 06/06/2017 06:35 AM, Ram Pai wrote: > > The value of the AMR register at the time of the exception > > is made available in gp_regs[PT_AMR] of the siginfo. > > But its already available there in uctxt->uc_mcontext.regs->amr > while inside the signal delivery context in the user space. The > pt_regs already got updated with new AMR register. Then why we > need gp_regs to also contain AMR as well ? Also changing gp_regs layout/size is a major ABI issue... Ben.