From patchwork Tue Oct 4 02:41:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 12997923 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 2AFFBC433F5 for ; Tue, 4 Oct 2022 02:42:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229897AbiJDCmc (ORCPT ); Mon, 3 Oct 2022 22:42:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229823AbiJDCm0 (ORCPT ); Mon, 3 Oct 2022 22:42:26 -0400 Received: from mail-qk1-x730.google.com (mail-qk1-x730.google.com [IPv6:2607:f8b0:4864:20::730]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C18E233A8 for ; Mon, 3 Oct 2022 19:42:25 -0700 (PDT) Received: by mail-qk1-x730.google.com with SMTP id x18so7685792qkn.6 for ; Mon, 03 Oct 2022 19:42:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=cyNPGKSpanWg1PBp+oFJtta8YoEUOyUADsqxsJVyYKI=; b=p7gxr8BOzPMoIl63Waae9ssjZi2XtE67S7yBYwewcinAF/AqvnClbq17oXihpKvHQi /8SzODU4rEaB9L2Xt7526x1uvkkX+cJFkK2yopse5rNtnLC42UWRgbODMXZAt/nh/FQ2 +mjgTe4d7MtTAJ/CJug4mLXOQgiCVUOeqwoho= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=cyNPGKSpanWg1PBp+oFJtta8YoEUOyUADsqxsJVyYKI=; b=jgYnJa/KTgtbzY1znNRE1j9AhfUiYf87kp2014heJ9tN/4BblAK1Q9ZvbtFAzyke8N APn2MVvQcokf322nokJ3Z5lqVtiMW6yQMHlfSTlvzYKV9Q4+ObnnDycJgfAd4GnS0Csc 9lSh14aZ+ffeBvoDbke/YKusqNAaifndZ0kvR2UuboJq/cKJRTPI+kT4LK4N4vITH3bD vRnyR6XRL0vfZBouuapwAhvuYUleZdNWnY9cE0gwvLt3DsAys4+wX6bvM7klQ5dVLxDo lvk49N10FQnaJ5N/TtP7YFIcSasByHeSBpBZDQ1gzBWDBY9LkzuA6NWm8VxHs9lD+ZTF +SVw== X-Gm-Message-State: ACrzQf3hXfDUBaurjzsOpXj5yAVUUOCdkqJzr6ksoCA6j+EtZ/puGJg9 5SiJfrkAFe7v9FdMlzUfofInWW3YCczN/g== X-Google-Smtp-Source: AMsMyM6fCVLZqIV9NJDDecY/faq4ubFj7YCBYr92jE5ezFM/7K/NssIz4oF08sZhf7H/Aa1rVIfyow== X-Received: by 2002:a05:620a:198a:b0:6ce:7f32:9f3f with SMTP id bm10-20020a05620a198a00b006ce7f329f3fmr15896386qkb.90.1664851344870; Mon, 03 Oct 2022 19:42:24 -0700 (PDT) Received: from joelboxx.c.googlers.com.com (228.221.150.34.bc.googleusercontent.com. [34.150.221.228]) by smtp.gmail.com with ESMTPSA id 1-20020ac85901000000b0035cf5edefa6sm11793875qty.56.2022.10.03.19.42.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 19:42:24 -0700 (PDT) From: "Joel Fernandes (Google)" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, rushikesh.s.kadam@intel.com, urezki@gmail.com, neeraj.iitr10@gmail.com, frederic@kernel.org, paulmck@kernel.org, rostedt@goodmis.org, youssefesmat@google.com, surenb@google.com, "Joel Fernandes (Google)" Subject: [PATCH v7 07/11] rcu/sync: Use call_rcu_flush() instead of call_rcu Date: Tue, 4 Oct 2022 02:41:53 +0000 Message-Id: <20221004024157.2470238-8-joel@joelfernandes.org> X-Mailer: git-send-email 2.38.0.rc1.362.ged0d419d3c-goog In-Reply-To: <20221004024157.2470238-1-joel@joelfernandes.org> References: <20221004024157.2470238-1-joel@joelfernandes.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org 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) --- 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 5cefc702158f..bdce3b5d7f71 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); } /**