From nobody Wed Oct 1 22:33:22 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 954D2306D5F; Wed, 1 Oct 2025 14:48:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759330122; cv=none; b=ch4tswwvdUAxPRZ8eF55P2HkG0DHaoZPcLeaJG9yf+UhcKMH/DHdpgAADo3fcsM17fwVMrHjYbV0c7JzCeZv36rdSXAhBxjZuxU70IvX4nZfxY3GE62gWrLMiKt6pQpPgXrmGk/rjw0tZDxSJ1q/jGAjP+hDmS3Og6H7DKw7AMQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759330122; c=relaxed/simple; bh=5+6cap8BHuj7LD+F6jHOG4xWIftMKuTGrdQG1g1VuNA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=DVBZlZcJVIReFHUkLeRIzLlqOv2iKed8tH5TzH6+9vt2BGdpo9R40bpSGMSYyJSIKgu5DgNoi23nmXkeGiIgF25MMO7rL8dbu7QO5HqSC1VYbEQqr0xowCEIcJN+Sp4A+N1wEeyLDJ3/4Voav3Rdq0BdbCenZYQUIhl5q7PDOuc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=f6DwVI9B; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="f6DwVI9B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DB44C4AF0D; Wed, 1 Oct 2025 14:48:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759330122; bh=5+6cap8BHuj7LD+F6jHOG4xWIftMKuTGrdQG1g1VuNA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f6DwVI9BxTl3oHt6mA0HcILf8ik6GGSoZ0OLMhSbPeoGtYBlGknaaIg6sYgLEEguR wPtFMJUy87rjzytPd91EVFqoMrnOS0Yw64gp0VE0nDUS2jOQFZNfxQ+u6WeUaJYHN6 dZ1iz9q8Wi+AUUKU7bKpetA+ezX3VJX8XKptL919h58Bgs798QdmpIGLyVsNHi2qdi JtazPj6Fx34F4JOxe1x1gYbpEfNcdMUlbuFiz2iyCaTFjPipUCs42ItPGJCDizjE0x wQERutENschQzUoKLXZLgF0YvesXC6RK02dOW9wfpP8j6z7/hSNkqEJk9WDDgUoFDf JUcGle4fbQ2ZQ== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 970E1CE158E; Wed, 1 Oct 2025 07:48:34 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Paul E. McKenney" , Leon Hwang , Alexei Starovoitov Subject: [PATCH v2 21/21] rcu: Mark diagnostic functions as notrace Date: Wed, 1 Oct 2025 07:48:32 -0700 Message-Id: <20251001144832.631770-21-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <7fa58961-2dce-4e08-8174-1d1cc592210f@paulmck-laptop> References: <7fa58961-2dce-4e08-8174-1d1cc592210f@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The rcu_lockdep_current_cpu_online(), rcu_read_lock_sched_held(), rcu_read_lock_held(), rcu_read_lock_bh_held(), rcu_read_lock_any_held() are used by tracing-related code paths, so putting traces on them is unlikely to make anyone happy. This commit therefore marks them all "notrace". Reported-by: Leon Hwang Reported-by: Alexei Starovoitov Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 2 +- kernel/rcu/update.c | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 31690ffa452afe..8ddd07fed36334 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4021,7 +4021,7 @@ bool rcu_cpu_online(int cpu) * RCU on an offline processor during initial boot, hence the check for * rcu_scheduler_fully_active. */ -bool rcu_lockdep_current_cpu_online(void) +bool notrace rcu_lockdep_current_cpu_online(void) { struct rcu_data *rdp; bool ret =3D false; diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index c912b594ba987f..dfeba9b3539508 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -117,7 +117,7 @@ static bool rcu_read_lock_held_common(bool *ret) return false; } =20 -int rcu_read_lock_sched_held(void) +int notrace rcu_read_lock_sched_held(void) { bool ret; =20 @@ -342,7 +342,7 @@ EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled); * Note that rcu_read_lock() is disallowed if the CPU is either idle or * offline from an RCU perspective, so check for those as well. */ -int rcu_read_lock_held(void) +int notrace rcu_read_lock_held(void) { bool ret; =20 @@ -367,7 +367,7 @@ EXPORT_SYMBOL_GPL(rcu_read_lock_held); * Note that rcu_read_lock_bh() is disallowed if the CPU is either idle or * offline from an RCU perspective, so check for those as well. */ -int rcu_read_lock_bh_held(void) +int notrace rcu_read_lock_bh_held(void) { bool ret; =20 @@ -377,7 +377,7 @@ int rcu_read_lock_bh_held(void) } EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); =20 -int rcu_read_lock_any_held(void) +int notrace rcu_read_lock_any_held(void) { bool ret; =20 --=20 2.40.1