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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,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 39E49C433DF for ; Tue, 26 May 2020 07:06:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D6CC20870 for ; Tue, 26 May 2020 07:06:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731370AbgEZHGx (ORCPT ); Tue, 26 May 2020 03:06:53 -0400 Received: from out30-131.freemail.mail.aliyun.com ([115.124.30.131]:49329 "EHLO out30-131.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726990AbgEZHGx (ORCPT ); Tue, 26 May 2020 03:06:53 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04427;MF=wetp.zy@linux.alibaba.com;NM=1;PH=DS;RN=4;SR=0;TI=SMTPD_---0TzhXv2Y_1590476801; Received: from localhost(mailfrom:wetp.zy@linux.alibaba.com fp:SMTPD_---0TzhXv2Y_1590476801) by smtp.aliyun-inc.com(127.0.0.1); Tue, 26 May 2020 15:06:50 +0800 From: Wetp Zhang To: n-horiguchi@ah.jp.nec.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm, memory_failure: only send BUS_MCEERR_AO to early-kill process Date: Tue, 26 May 2020 15:06:41 +0800 Message-Id: <1590476801-19882-1-git-send-email-wetp.zy@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zhang Yi If a process don't need early-kill, it may not care the BUS_MCEERR_AO. Let the process to be killed when it really access the corrupted memory. Signed-off-by: Zhang Yi --- mm/memory-failure.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index a96364be8ab4..2db13d48865c 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -210,7 +210,7 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags) { struct task_struct *t = tk->tsk; short addr_lsb = tk->size_shift; - int ret; + int ret = 0; pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n", pfn, t->comm, t->pid); @@ -225,8 +225,9 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags) * This could cause a loop when the user sets SIGBUS * to SIG_IGN, but hopefully no one will do that? */ - ret = send_sig_mceerr(BUS_MCEERR_AO, (void __user *)tk->addr, - addr_lsb, t); /* synchronous? */ + if ((t->flags & PF_MCE_PROCESS) && (t->flags & PF_MCE_EARLY)) + ret = send_sig_mceerr(BUS_MCEERR_AO, + (void __user *)tk->addr, addr_lsb, t); } if (ret < 0) pr_info("Memory failure: Error sending signal to %s:%d: %d\n", -- 2.14.3 (Apple Git-98)