From patchwork Tue Nov 22 01:04:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 13051756 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 2810EC43217 for ; Tue, 22 Nov 2022 01:04:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232046AbiKVBEc (ORCPT ); Mon, 21 Nov 2022 20:04:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231981AbiKVBE0 (ORCPT ); Mon, 21 Nov 2022 20:04:26 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08CB81E711; Mon, 21 Nov 2022 17:04:26 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id B0FB8B818E7; Tue, 22 Nov 2022 01:04:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E6D6C43152; Tue, 22 Nov 2022 01:04:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669079063; bh=uyDGWyzfPaiQ/+Iwibul18/2tA5ta5E2a9H+CSNE/yA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CFD1MnASm3nHVWtRNYrL1YNSkJ5NsCu6EMrtc9wT9RYHFupnOEhBIAelJJBkbzfGL seRGP7i+PbVg1o0P3F1yYAPd3lyPeCP89i7G3HCyh1Yv2OdZmtWtWY2D7lQ6m2ik6S tTy8OF9izkP9LALFdQy2sxTkMETa6y9JhV0xijdnV7JSV0nk1zGEAM4OispMp4zXi2 20ag4F1cNLMmHLWWwfLlY+W9hIoK+z4kDZR0I9gS0SoA9wxDdH6r7XvH6mtchSbpcD DKKtg8DLBSgLnq7hdM6bn6h1dGUIgGSqhWoppMo0DBYToKWLv5JVS5Z2JO1tePUUKi cwSGc+lBsYzHg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 814A35C1409; Mon, 21 Nov 2022 17:04:22 -0800 (PST) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Joel Fernandes (Google)" , "Paul E . McKenney" Subject: [PATCH v2 rcu 09/16] rcu/sync: Use call_rcu_flush() instead of call_rcu Date: Mon, 21 Nov 2022 17:04:14 -0800 Message-Id: <20221122010421.3799681-9-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20221122010408.GA3799268@paulmck-ThinkPad-P17-Gen-1> References: <20221122010408.GA3799268@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: "Joel Fernandes (Google)" call_rcu() changes to save power will slow down rcu sync. Use the call_rcu_flush() API instead which reverts to the old behavior. Signed-off-by: Joel Fernandes (Google) Signed-off-by: Paul E. McKenney --- kernel/rcu/sync.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c index 5cefc702158fe..bdce3b5d7f714 100644 --- a/kernel/rcu/sync.c +++ b/kernel/rcu/sync.c @@ -44,7 +44,7 @@ static void rcu_sync_func(struct rcu_head *rhp); static void rcu_sync_call(struct rcu_sync *rsp) { - call_rcu(&rsp->cb_head, rcu_sync_func); + call_rcu_flush(&rsp->cb_head, rcu_sync_func); } /**