From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7FA95ECE563 for ; Tue, 18 Sep 2018 00:12:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 40CA5214D5 for ; Tue, 18 Sep 2018 00:12:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 40CA5214D5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xmission.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729047AbeIRFm3 (ORCPT ); Tue, 18 Sep 2018 01:42:29 -0400 Received: from out03.mta.xmission.com ([166.70.13.233]:33869 "EHLO out03.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727106AbeIRFm2 (ORCPT ); Tue, 18 Sep 2018 01:42:28 -0400 Received: from in02.mta.xmission.com ([166.70.13.52]) by out03.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1g23dC-0007o7-3r; Mon, 17 Sep 2018 18:12:42 -0600 Received: from [105.184.227.67] (helo=x220.Home) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_CBC_SHA256:128) (Exim 4.87) (envelope-from ) id 1g23ZR-0002Qk-PA; Mon, 17 Sep 2018 18:08:50 -0600 From: "Eric W. Biederman" To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, Thomas Gleixner , Ingo Molnar , x86@kernel.org, "Eric W. Biederman" Date: Tue, 18 Sep 2018 02:05:41 +0200 Message-Id: <20180918000546.12552-15-ebiederm@xmission.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <87y3bzk6yv.fsf@xmission.com> References: <87y3bzk6yv.fsf@xmission.com> X-XM-SPF: eid=1g23ZR-0002Qk-PA;;;mid=<20180918000546.12552-15-ebiederm@xmission.com>;;;hst=in02.mta.xmission.com;;;ip=105.184.227.67;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1+5heJbxFrUdSjKm2/oLqQUBr8kMvsto/U= X-SA-Exim-Connect-IP: 105.184.227.67 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: [REVIEW][PATCH 15/20] signal/x86: Don't compute pkey in __do_page_fault X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are no more users of the computed pkey value in __do_page_fault so stop computing the value. Signed-off-by: "Eric W. Biederman" --- arch/x86/mm/fault.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 7ba00519fa5d..f82106578364 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1215,7 +1215,6 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, struct mm_struct *mm; vm_fault_t fault, major = 0; unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; - u32 pkey; tsk = current; mm = tsk->mm; @@ -1387,10 +1386,7 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, * (potentially after handling any pending signal during the return to * userland). The return to userland is identified whenever * FAULT_FLAG_USER|FAULT_FLAG_KILLABLE are both set in flags. - * Thus we have to be careful about not touching vma after handling the - * fault, so we read the pkey beforehand. */ - pkey = vma_pkey(vma); fault = handle_mm_fault(vma, address, flags); major |= fault & VM_FAULT_MAJOR; -- 2.17.1