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 393D52EEE77; Fri, 31 Jul 2026 01:07:23 +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=1785460045; cv=none; b=Ge72kGpDwrFjwyiroykFVjzyD2nbJLbnOOxC2KBmzgxZ4o8R9aiTpiz46XnLV0XCECnZvm/fnhMO+PeKEl9m885edr7mnr2D9VMoEuNKXwti4z6k5W+2WWUD23cNyGSd1POYeSsumCOuAdUMTWeFr/STJkl9lbcg0l+ljzBNW/k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785460045; c=relaxed/simple; bh=5TRH08HpnQpKefliFHBcZse/jV9F6sm8wkK7QGwdEwI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ug9xRhkcTk/3lDe02HONTtHG1JPigLxLeOXSYJOgHsNLJVHtVgFjSRMzKfPO2rMoVnNzHEtuQh8uN/ZBr/Z5j+h7AFWepAKmQoNbmtVu76D9Yhy6N9jtoLsZzyl/A0xQhcl9DQbFqoHqebJkc+ALmz45IBlF+rP+3CYmIlNeqBY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GsU5mEvp; 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="GsU5mEvp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DB601F0155A; Fri, 31 Jul 2026 01:07:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785460041; bh=e8XPOoUXngqgBuzXy/XFx1AR3lM5r9CAVwZr40LUuY4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GsU5mEvpsvcqLfuJ+TcdpVqeKuXuJudAv+JeHtcVlpch8JurcduoB93lRVGU6dph8 go4pDuQomky9hjUi3guEHSz38djKWSpWKd7wPh57hcHpkin+g7eJDCRW6EdowEUOLB Lt0+0uoGDSYjZQtxYaqp+502TpkwN9aUo7NYgRGRimI5u5qkXnGEz32fm2kP34fTE5 sA9+FOnIHjbmInfj3+0XzMwuAXDPAVvCDdfx+BaR/aFpairH3Syk9HxR6o9s4TaC6V jhtJby22+7PwHo7ewnlekN/ah3XSQf/tb1WgNQdzshMM6iVhm7ZHFwRpmXKOraXLI8 InlA5/Y1h+agg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 99849CE14DB; Thu, 30 Jul 2026 18:07:20 -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 v2 10/13] rcutorture: Use this_cpu_inc() for rcu_torture_count[] and rcu_torture_batch[] Date: Thu, 30 Jul 2026 18:07:16 -0700 Message-Id: <20260731010719.3531912-10-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: References: 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