From patchwork Tue Feb 27 10:22:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniil Dulov X-Patchwork-Id: 13573501 Received: from mail-out.aladdin-rd.ru (mail-out.aladdin-rd.ru [91.199.251.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A3D2213849F; Tue, 27 Feb 2024 10:26:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.199.251.16 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709029601; cv=none; b=FwO8/XnsMtQMbO3nMQBLQql5b025gPMJuX2qw2Bn7ciRa00TSH/XY9V0cEhfYm/JZo7UFU2F/WM8zGSj++kfQHIF5+efFp66qRHQauuSD/JGO1e1IP0FlEOpL5T6VqtcqHQ/Yq5ksIl+Pl83UnipeP8pog9vG5i74l6sahLw7s4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709029601; c=relaxed/simple; bh=2V6msSSOGznnB/lFtzfEFRZx43Zk7T3DtjKa16ZisKg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rI6n4HaWk9zcqCVYJhGdoSrwYR8bDuy0Me4D46Pm4JIvDvaBkxNphD/+6cUD+gTURRE5Ya6xfGTNjRU+UniGOIOaj4BWgSmVi2NaJ4/BGBZg0cCrarpY/WESPCmd/BrZU4eg2ksc6N1XxdSYbrCv8ShrVkteLeBKf27vfZIArQ8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=aladdin.ru; spf=pass smtp.mailfrom=aladdin.ru; arc=none smtp.client-ip=91.199.251.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=aladdin.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aladdin.ru From: Daniil Dulov To: Greg Kroah-Hartman , CC: Daniil Dulov , Davidlohr Bueso , "Paul E. McKenney" , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Joel Fernandes , , , , David Vernet Subject: [PATCH 5.15 1/1] rcutorture: Add missing return and use __func__ in warning Date: Tue, 27 Feb 2024 13:22:22 +0300 Message-ID: <20240227102222.29584-2-d.dulov@aladdin.ru> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240227102222.29584-1-d.dulov@aladdin.ru> References: <20240227102222.29584-1-d.dulov@aladdin.ru> Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EXCH-2016-04.aladdin.ru (192.168.1.104) To EXCH-2016-01.aladdin.ru (192.168.1.101) From: David Vernet commit 80dcee695143255261f30c7cc2a041ba413717a4 upstream. The rcutorture module has an rcu_torture_writer task that repeatedly performs writes, synchronizations, and deletes. There is a corner-case check in rcu_torture_writer() wherein if nsynctypes is 0, a warning is issued and the task waits to be stopped via a call to torture_kthread_stopping() rather than performing any work. There should be a return statement following this call to torture_kthread_stopping(), as the intention with issuing the call to torture_kthread_stopping() in the first place is to avoid the rcu_torture_writer task from performing any work. Some of the work may even be dangerous to perform, such as potentially causing a #DE due to nsynctypes being used in a modulo operator when querying for sync updates to issue. This patch adds the missing return call. As a bonus, it also fixes a checkpatch warning that was emitted due to the WARN_ONCE() call using the name of the function rather than __func__. Signed-off-by: David Vernet Signed-off-by: Paul E. McKenney Signed-off-by: Daniil Dulov --- kernel/rcu/rcutorture.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index d820ef615475..a76399bd43b9 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1165,7 +1165,7 @@ rcu_torture_writer(void *arg) " GP expediting controlled from boot/sysfs for %s.\n", torture_type, cur_ops->name); if (WARN_ONCE(nsynctypes == 0, - "rcu_torture_writer: No update-side primitives.\n")) { + "%s: No update-side primitives.\n", __func__)) { /* * No updates primitives, so don't try updating. * The resulting test won't be testing much, hence the @@ -1173,6 +1173,7 @@ rcu_torture_writer(void *arg) */ rcu_torture_writer_state = RTWS_STOPPING; torture_kthread_stopping("rcu_torture_writer"); + return 0; } do {