From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 D8E3A2C028F; Thu, 16 Jul 2026 00:25:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784161531; cv=none; b=ftbDuBw7YoCt21/5+jhEtUPQq20nEk4Os5Lq9aVeWTSvfv6g+lM3het6ZIIpqXdpWTBiwvgL+jhqBf+9bRkVnxkd9ACod10Nsxlut3qr9LuJ+UE9A2Z5XyqFUTPUNVYGOxXVQyx/xP/XI/XrHFE2y3DHijNXMyj3pyLi17AOgOQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784161531; c=relaxed/simple; bh=5TRH08HpnQpKefliFHBcZse/jV9F6sm8wkK7QGwdEwI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=arLvxTXGFg8bl6RU79OG65owj+Ggw7aamZvRwfTdN5cR3gUuU3A7gVdiMc5RXVtvGmD8SdwL4vopLXVu33LySzdjIL3tNRBJnjr1+3pkjOGGONsF4csWph253AB/JIdCpS9CzD7DCAuVYNN2v917N55nsmQwta2KUcfize8ZJjA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hmP4Wtj8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hmP4Wtj8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF1011F01559; Thu, 16 Jul 2026 00:25:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784161523; bh=e8XPOoUXngqgBuzXy/XFx1AR3lM5r9CAVwZr40LUuY4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hmP4Wtj8ai4zKr7Mky+15dV+y0X7AtLz0BT2nUgJtAx5YCyBUoz5IHlkCwfr3n19h ON8Fud1G347Jcy3SEvUS0r19v7OpnMU9rk7fjVuqztYmT8Hn5wCnGHYxXGi+PExPVR h4eJEsRSwEHBWkpRNN3Dz/FjBDezSh7KsPXlC+GFVY3qWq0W7wmdvJnbT0hhGZbzvp suMq9UjO6AAwsDXk7bRnv6fyAG0YZRdmsaurRtnjMmlnvaL74IdrmVTZx+Qln0eIYt cAzYhdCuR8tIZiyV05n0ZswriWmVI+e6o9uVEHyXHTGm1sWf9PRoJRXWC1pIzzopyS sGv0lSM7usRIg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 88B48CE0E8B; Wed, 15 Jul 2026 17:25:22 -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" Subject: [PATCH 11/11] rcutorture: Use this_cpu_inc() for rcu_torture_count[] and rcu_torture_batch[] Date: Wed, 15 Jul 2026 17:25:20 -0700 Message-Id: <20260716002520.11895-11-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <3f56c779-b900-40f9-9a24-6136fb28ddfb@paulmck-laptop> References: <3f56c779-b900-40f9-9a24-6136fb28ddfb@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: 8bit Currently __this_cpu_inc() is used to increment elements of both the rcu_torture_count[] and rcu_torture_batch[] arrays. However, this can fail when the increments can happen in interrupt handlers, as recently became possible. This commit therefore upgrades the uses of __this_cpu_inc() to the interrupt-safe this_cpu_inc(). KCSAN located this issue. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 8514fef3ec10b6..9180016d87c0ce 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2565,13 +2565,13 @@ static void rcu_torture_one_read_end(struct rcu_torture_one_read_state *rtorsp, rtorsp->ts, rtorsp->started, completed); rcu_ftrace_dump(DUMP_ALL); } - __this_cpu_inc(rcu_torture_count[pipe_count]); + this_cpu_inc(rcu_torture_count[pipe_count]); completed = rcutorture_seq_diff(completed, rtorsp->started); if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } - __this_cpu_inc(rcu_torture_batch[completed]); + this_cpu_inc(rcu_torture_batch[completed]); preempt_enable(); if (rtorsp->checkpolling) { if (cur_ops->get_gp_state && cur_ops->poll_gp_state) -- 2.40.1