From patchwork Wed Feb 16 09:14:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12748271 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98683C433F5 for ; Wed, 16 Feb 2022 09:15:22 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A3DFC6B0085; Wed, 16 Feb 2022 04:15:19 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 88D636B007E; Wed, 16 Feb 2022 04:15:19 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6B8AF6B0082; Wed, 16 Feb 2022 04:15:19 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0033.hostedemail.com [216.40.44.33]) by kanga.kvack.org (Postfix) with ESMTP id 5222A6B007E for ; Wed, 16 Feb 2022 04:15:19 -0500 (EST) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id F2FAB180AC325 for ; Wed, 16 Feb 2022 09:15:18 +0000 (UTC) X-FDA: 79148084316.29.1889BD3 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by imf30.hostedemail.com (Postfix) with ESMTP id 1A30180005 for ; Wed, 16 Feb 2022 09:15:17 +0000 (UTC) Received: from canpemm500002.china.huawei.com (unknown [172.30.72.55]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4JzC282pQNzcbhC; Wed, 16 Feb 2022 17:14:08 +0800 (CST) Received: from huawei.com (10.175.124.27) by canpemm500002.china.huawei.com (7.192.104.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Wed, 16 Feb 2022 17:15:14 +0800 From: Miaohe Lin To: , CC: , , Subject: [PATCH v2 3/8] mm/memory-failure.c: rework the signaling logic in kill_proc Date: Wed, 16 Feb 2022 17:14:26 +0800 Message-ID: <20220216091431.39406-4-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20220216091431.39406-1-linmiaohe@huawei.com> References: <20220216091431.39406-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 1A30180005 X-Stat-Signature: 5izeqthdoxx9b7w6fgbfresmyuhtsbo7 X-Rspam-User: Authentication-Results: imf30.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf30.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.187 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-HE-Tag: 1645002917-526038 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: BUS_MCEERR_AR code is only sent when MF_ACTION_REQUIRED is set and the target is current. Rework the code to make this clear. Signed-off-by: Miaohe Lin Acked-by: Naoya Horiguchi --- mm/memory-failure.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index eaa241058401..7e205d91b2d7 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -258,16 +258,13 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags) pr_err("Memory failure: %#lx: Sending SIGBUS to %s:%d due to hardware memory corruption\n", pfn, t->comm, t->pid); - if (flags & MF_ACTION_REQUIRED) { - if (t == current) - ret = force_sig_mceerr(BUS_MCEERR_AR, - (void __user *)tk->addr, addr_lsb); - else - /* Signal other processes sharing the page if they have PF_MCE_EARLY set. */ - ret = send_sig_mceerr(BUS_MCEERR_AO, (void __user *)tk->addr, - addr_lsb, t); - } else { + if ((flags & MF_ACTION_REQUIRED) && (t == current)) + ret = force_sig_mceerr(BUS_MCEERR_AR, + (void __user *)tk->addr, addr_lsb); + else /* + * Signal other processes sharing the page if they have + * PF_MCE_EARLY set. * Don't use force here, it's convenient if the signal * can be temporarily blocked. * This could cause a loop when the user sets SIGBUS @@ -275,7 +272,6 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags) */ ret = send_sig_mceerr(BUS_MCEERR_AO, (void __user *)tk->addr, addr_lsb, t); /* synchronous? */ - } if (ret < 0) pr_info("Memory failure: Error sending signal to %s:%d: %d\n", t->comm, t->pid, ret);