From patchwork Wed May 18 00:52:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jackie Liu X-Patchwork-Id: 12853036 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 BC38BC433EF for ; Wed, 18 May 2022 00:52:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2C94C6B0072; Tue, 17 May 2022 20:52:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 250A16B0073; Tue, 17 May 2022 20:52:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F2D96B0074; Tue, 17 May 2022 20:52:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id EFFE76B0072 for ; Tue, 17 May 2022 20:52:13 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay11.hostedemail.com (Postfix) with ESMTP id B5BCD80274 for ; Wed, 18 May 2022 00:52:13 +0000 (UTC) X-FDA: 79477037346.29.9879DC4 Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by imf04.hostedemail.com (Postfix) with ESMTP id 1EFA5400D1 for ; Wed, 18 May 2022 00:51:59 +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=1652835130; 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=pqfn+Mn0DYWU3NSDwIhdEh/eAd5JYvU0926dCbu4dhw=; b=ZLKHuiaR7X1wX4+DA6qIZ3ty5MRFTGAKmuwlnLDn3gGutjkTXgpdWf1OnH6xCSn0j/9SYV Zsqz32Ji7P2yrMw+wtpORC+8/9NoC3+K/RXk0Gfzt0dqR4QHnXuD4G/LHvpsob6W1T5r5T M7WbLM6hWmtdTF+VREFWk3DW+Xp1O+w= 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 v2] mm/kfence: print disabling or re-enabling message Date: Wed, 18 May 2022 08:52:00 +0800 Message-Id: <20220518005200.4150246-1-liu.yun@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=ZLKHuiaR; spf=pass (imf04.hostedemail.com: domain of liu.yun@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=liu.yun@linux.dev; dmarc=pass (policy=none) header.from=linux.dev X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1EFA5400D1 X-Stat-Signature: 4a83mha8e1qzy6drmaqs7r66ruobypzu X-HE-Tag: 1652835119-454926 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 mm/kfence/core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/kfence/core.c b/mm/kfence/core.c index 11a954763be9..de5bcf2609fe 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -67,8 +67,12 @@ 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. */ + /* 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 +878,7 @@ 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; }