From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751817AbeCTVcL (ORCPT ); Tue, 20 Mar 2018 17:32:11 -0400 Received: from out30-133.freemail.mail.aliyun.com ([115.124.30.133]:51889 "EHLO out30-133.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751715AbeCTVcD (ORCPT ); Tue, 20 Mar 2018 17:32:03 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R151e4;CH=green;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e07486;MF=yang.shi@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0SzoMu-x_1521581495; From: Yang Shi To: akpm@linux-foundation.org Cc: yang.shi@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ricardo Neri , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Borislav Petkov , x86@kernel.org Subject: [RFC PATCH 7/8] x86: mpx: pass atomic parameter to do_munmap() Date: Wed, 21 Mar 2018 05:31:25 +0800 Message-Id: <1521581486-99134-8-git-send-email-yang.shi@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1521581486-99134-1-git-send-email-yang.shi@linux.alibaba.com> References: <1521581486-99134-1-git-send-email-yang.shi@linux.alibaba.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pass "true" to do_munmap() to not do unlock/relock to mmap_sem when manipulating mpx map. This is API change only. Signed-off-by: Yang Shi Cc: Ricardo Neri Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Borislav Petkov Cc: x86@kernel.org --- arch/x86/mm/mpx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c index e500949..a180e94 100644 --- a/arch/x86/mm/mpx.c +++ b/arch/x86/mm/mpx.c @@ -780,7 +780,7 @@ static int unmap_entire_bt(struct mm_struct *mm, * avoid recursion, do_munmap() will check whether it comes * from one bounds table through VM_MPX flag. */ - return do_munmap(mm, bt_addr, mpx_bt_size_bytes(mm), NULL); + return do_munmap(mm, bt_addr, mpx_bt_size_bytes(mm), NULL, true); } static int try_unmap_single_bt(struct mm_struct *mm, -- 1.8.3.1