From mboxrd@z Thu Jan 1 00:00:00 1970 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 8DEBDC7EE23 for ; Mon, 8 May 2023 10:25:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234461AbjEHKZB (ORCPT ); Mon, 8 May 2023 06:25:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234455AbjEHKYZ (ORCPT ); Mon, 8 May 2023 06:24:25 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92E7226465 for ; Mon, 8 May 2023 03:24:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 26AE8625B0 for ; Mon, 8 May 2023 10:24:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04531C433EF; Mon, 8 May 2023 10:24:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683541446; bh=fWRoKHGdmRoiWljH8r09kaU4EyvJt97EAsRiSgj5pcY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cjGE5iW5zZU+HtPpJHTIQ1/cuNhHk3tG7Xc37opLJGXJA2fTualt2KS3W8iLR/5vy ZufhdYsVRPujiTL4jijuvBX50IwH/CoD8zP2ToV78dV+kyCtho9QJH+ZAwMAe1xVIc N0FdxAnlFnKzG0vuk9mgsZ87PBMjgXPY/8Lp5ero= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zqiang , Steven Rostedt , Masami Hiramatsu , Frederic Weisbecker , Thomas Gleixner , Ingo Molnar , Anna-Maria Behnsen , Frederic Weisbecker , "Paul E. McKenney" , "Joel Fernandes (Google)" , Sasha Levin Subject: [PATCH 6.2 117/663] rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check Date: Mon, 8 May 2023 11:39:03 +0200 Message-Id: <20230508094432.304226241@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094428.384831245@linuxfoundation.org> References: <20230508094428.384831245@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zqiang [ Upstream commit db7b464df9d820186e98a65aa6a10f0d51fbf8ce ] This commit adds checks for the TICK_DEP_MASK_RCU_EXP bit, thus enabling RCU expedited grace periods to actually force-enable scheduling-clock interrupts on holdout CPUs. Fixes: df1e849ae455 ("rcu: Enable tick for nohz_full CPUs slow to provide expedited QS") Signed-off-by: Zqiang Cc: Steven Rostedt Cc: Masami Hiramatsu Cc: Frederic Weisbecker Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Anna-Maria Behnsen Acked-by: Frederic Weisbecker Signed-off-by: Paul E. McKenney Signed-off-by: Joel Fernandes (Google) Signed-off-by: Sasha Levin --- include/trace/events/timer.h | 3 ++- kernel/time/tick-sched.c | 5 +++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h index 2e713a7d9aa3a..3e8619c72f774 100644 --- a/include/trace/events/timer.h +++ b/include/trace/events/timer.h @@ -371,7 +371,8 @@ TRACE_EVENT(itimer_expire, tick_dep_name(PERF_EVENTS) \ tick_dep_name(SCHED) \ tick_dep_name(CLOCK_UNSTABLE) \ - tick_dep_name_end(RCU) + tick_dep_name(RCU) \ + tick_dep_name_end(RCU_EXP) #undef tick_dep_name #undef tick_dep_mask_name diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 68d81a4283c89..a46506f7ec6d0 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -281,6 +281,11 @@ static bool check_tick_dependency(atomic_t *dep) return true; } + if (val & TICK_DEP_MASK_RCU_EXP) { + trace_tick_stop(0, TICK_DEP_MASK_RCU_EXP); + return true; + } + return false; } -- 2.39.2