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 3C0C9C433EF for ; Thu, 17 Feb 2022 11:28:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 876016B0074; Thu, 17 Feb 2022 06:28:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 825C36B0075; Thu, 17 Feb 2022 06:28:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6EDE86B0078; Thu, 17 Feb 2022 06:28:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0130.hostedemail.com [216.40.44.130]) by kanga.kvack.org (Postfix) with ESMTP id 5F9A66B0074 for ; Thu, 17 Feb 2022 06:28:04 -0500 (EST) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 23F37951A0 for ; Thu, 17 Feb 2022 11:28:04 +0000 (UTC) X-FDA: 79152047688.06.9CE505B Received: from lgeamrelo11.lge.com (lgeamrelo12.lge.com [156.147.23.52]) by imf07.hostedemail.com (Postfix) with ESMTP id 3C4F240003 for ; Thu, 17 Feb 2022 11:28:01 +0000 (UTC) Received: from unknown (HELO lgeamrelo01.lge.com) (156.147.1.125) by 156.147.23.52 with ESMTP; 17 Feb 2022 19:58:00 +0900 X-Original-SENDERIP: 156.147.1.125 X-Original-MAILFROM: byungchul.park@lge.com Received: from unknown (HELO localhost.localdomain) (10.177.244.38) by 156.147.1.125 with ESMTP; 17 Feb 2022 19:58:00 +0900 X-Original-SENDERIP: 10.177.244.38 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: torvalds@linux-foundation.org Cc: damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, chris@chris-wilson.co.uk, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, bfields@fieldses.org, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, axboe@kernel.dk, paolo.valente@linaro.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, jack@suse.com, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, airlied@linux.ie, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com Subject: [PATCH 15/16] locking/lockdep, cpu/hotplus: Use a weaker annotation in AP thread Date: Thu, 17 Feb 2022 19:57:51 +0900 Message-Id: <1645095472-26530-16-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1645095472-26530-1-git-send-email-byungchul.park@lge.com> References: <1645095472-26530-1-git-send-email-byungchul.park@lge.com> Authentication-Results: imf07.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf07.hostedemail.com: domain of byungchul.park@lge.com designates 156.147.23.52 as permitted sender) smtp.mailfrom=byungchul.park@lge.com X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 3C4F240003 X-Stat-Signature: 155gmfg9xyhitgs4tpsbezjtykntingq X-HE-Tag: 1645097281-438316 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: cb92173d1f0 (locking/lockdep, cpu/hotplug: Annotate AP thread) was introduced to make lockdep_assert_cpus_held() work in AP thread. However, the annotation is too strong for that purpose. We don't have to use more than try lock annotation for that. Furthermore, now that Dept was introduced, false positive alarms was reported by that. Replaced it with try lock annotation. Signed-off-by: Byungchul Park --- kernel/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index 407a256..1f92a42 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -355,7 +355,7 @@ int lockdep_is_cpus_held(void) static void lockdep_acquire_cpus_lock(void) { - rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 0, _THIS_IP_); + rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 1, _THIS_IP_); } static void lockdep_release_cpus_lock(void) -- 1.9.1