From patchwork Fri Apr 29 21:48:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Eric W. Biederman" X-Patchwork-Id: 568683 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 019A3C433FE for ; Fri, 29 Apr 2022 21:49:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239528AbiD2Vwa (ORCPT ); Fri, 29 Apr 2022 17:52:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239541AbiD2Vwa (ORCPT ); Fri, 29 Apr 2022 17:52:30 -0400 Received: from out01.mta.xmission.com (out01.mta.xmission.com [166.70.13.231]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 490C5DB4B6; Fri, 29 Apr 2022 14:49:11 -0700 (PDT) Received: from in02.mta.xmission.com ([166.70.13.52]:49840) by out01.mta.xmission.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1nkYUA-007OD7-DD; Fri, 29 Apr 2022 15:49:10 -0600 Received: from ip68-227-174-4.om.om.cox.net ([68.227.174.4]:36464 helo=localhost.localdomain) by in02.mta.xmission.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1nkYU9-007RIp-7i; Fri, 29 Apr 2022 15:49:09 -0600 From: "Eric W. Biederman" To: linux-kernel@vger.kernel.org Cc: rjw@rjwysocki.net, Oleg Nesterov , mingo@kernel.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, mgorman@suse.de, bigeasy@linutronix.de, Will Deacon , tj@kernel.org, linux-pm@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Kees Cook , Jann Horn , linux-ia64@vger.kernel.org, "Eric W. Biederman" Date: Fri, 29 Apr 2022 16:48:30 -0500 Message-Id: <20220429214837.386518-5-ebiederm@xmission.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> References: <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> MIME-Version: 1.0 X-XM-SPF: eid=1nkYU9-007RIp-7i; ; ; mid=<20220429214837.386518-5-ebiederm@xmission.com>; ; ; hst=in02.mta.xmission.com; ; ; ip=68.227.174.4; ; ; frm=ebiederm@xmission.com; ; ; spf=softfail X-XM-AID: U2FsdGVkX1/m1omujSCUx+WoYaAXDnsPr1oSU3IgaAc= X-SA-Exim-Connect-IP: 68.227.174.4 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: [PATCH v2 05/12] signal: Use lockdep_assert_held instead of assert_spin_locked X-SA-Exim-Version: 4.2.1 (built Sat, 08 Feb 2020 21:53:50 +0000) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The distinction is that assert_spin_locked() checks if the lock is held *by*anyone* whereas lockdep_assert_held() asserts the current context holds the lock. Also, the check goes away if you build without lockdep. Suggested-by: Peter Zijlstra Link: https://lkml.kernel.org/r/Ympr/+PX4XgT/UKU@hirez.programming.kicks-ass.net Signed-off-by: "Eric W. Biederman" --- kernel/signal.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/signal.c b/kernel/signal.c index 72d96614effc..3fd2ce133387 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -884,7 +884,7 @@ static int check_kill_permission(int sig, struct kernel_siginfo *info, static void ptrace_trap_notify(struct task_struct *t) { WARN_ON_ONCE(!(t->ptrace & PT_SEIZED)); - assert_spin_locked(&t->sighand->siglock); + lockdep_assert_held(&t->sighand->siglock); task_set_jobctl_pending(t, JOBCTL_TRAP_NOTIFY); ptrace_signal_wake_up(t, t->jobctl & JOBCTL_LISTENING); @@ -1079,7 +1079,7 @@ static int __send_signal_locked(int sig, struct kernel_siginfo *info, int override_rlimit; int ret = 0, result; - assert_spin_locked(&t->sighand->siglock); + lockdep_assert_held(&t->sighand->siglock); result = TRACE_SIGNAL_IGNORED; if (!prepare_signal(sig, t, force))