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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36793C433F5 for ; Wed, 18 May 2022 01:03:52 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 727536B0072; Tue, 17 May 2022 21:03:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6D7136B0073; Tue, 17 May 2022 21:03:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 59E156B0074; Tue, 17 May 2022 21:03:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 46D426B0072 for ; Tue, 17 May 2022 21:03:51 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 1DC8A2FF8E for ; Wed, 18 May 2022 01:03:51 +0000 (UTC) X-FDA: 79477066662.14.802FF73 Received: from out2.migadu.com (out2.migadu.com [188.165.223.204]) by imf07.hostedemail.com (Postfix) with ESMTP id E9863400B8 for ; Wed, 18 May 2022 01:03:41 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1652835828; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=IV8aCkpgePtdIt2HbGuwXZxBeztp0KNzc6pwPhSXF1Y=; b=WmW7H0/8fiQ6vWX2yAdnhTZh8fHu6EV2RaJI3FOYQUnGrHtj0BIvqShy0ggcZ93NAbL6E3 6nLg7uCG21jIxJseUFUei1ENlWPe6R20bU+Etr9zDWBPY+COpY+pmj5S53L3dWlB93LRW8 1wTOEWxq+10t78shJB8SaSGQfm3FM04= From: Jackie Liu To: elver@google.com Cc: glider@google.com, liu.yun@linux.dev, dvyukov@google.com, kasan-dev@googlegroups.com, linux-mm@kvack.org Subject: [PATCH v3] mm/kfence: print disabling or re-enabling message Date: Wed, 18 May 2022 09:03:19 +0800 Message-Id: <20220518010319.4161482-1-liu.yun@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-Rspamd-Queue-Id: E9863400B8 X-Stat-Signature: jhsb4b4dha9thcbc9qqaqnyznuwidwny Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="WmW7H0/8"; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf07.hostedemail.com: domain of liu.yun@linux.dev designates 188.165.223.204 as permitted sender) smtp.mailfrom=liu.yun@linux.dev X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1652835821-871829 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: From: Jackie Liu By printing information, we can friendly prompt the status change information of kfence by dmesg and record by syslog. Co-developed-by: Marco Elver Signed-off-by: Jackie Liu --- v1->v2: fixup by Marco Elver v2->v3: write kfence_enabled=false only true before mm/kfence/core.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/kfence/core.c b/mm/kfence/core.c index 11a954763be9..41840b8d9cb3 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -67,8 +67,13 @@ static int param_set_sample_interval(const char *val, const struct kernel_param if (ret < 0) return ret; - if (!num) /* Using 0 to indicate KFENCE is disabled. */ - WRITE_ONCE(kfence_enabled, false); + /* Using 0 to indicate KFENCE is disabled. */ + if (!num) { + if (READ_ONCE(kfence_enabled)) { + pr_info("disabled\n"); + WRITE_ONCE(kfence_enabled, false); + } + } *((unsigned long *)kp->arg) = num; @@ -874,6 +879,7 @@ static int kfence_enable_late(void) WRITE_ONCE(kfence_enabled, true); queue_delayed_work(system_unbound_wq, &kfence_timer, 0); + pr_info("re-enabled\n"); return 0; } -- 2.25.1