From patchwork Wed Aug 31 18:12:00 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: 12961244 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 7AE93ECAAD1 for ; Wed, 31 Aug 2022 18:14:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231383AbiHaSO4 (ORCPT ); Wed, 31 Aug 2022 14:14:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232439AbiHaSN5 (ORCPT ); Wed, 31 Aug 2022 14:13:57 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5FCDEEF1B; Wed, 31 Aug 2022 11:12:40 -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 sin.source.kernel.org (Postfix) with ESMTPS id 74B7DCE2059; Wed, 31 Aug 2022 18:12:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26BCCC43153; Wed, 31 Aug 2022 18:12:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661969532; bh=KuPCDZDlslpAEicML1omMI9g8VsZjZDGBIoeSeH7tzI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SBc4SVsEXrVsOj6xMNA3CYQyJFu9AR0xAAs28Yo3gMF1s3LSF0KP6yZs3MXh0OyP8 Ix+9avzZ8WbyJZdnRzKsCcP+yqwPw16zDsMThPMZDdwZkTl6deL8Ha4CjuoTJuaiFw mB0TwfbBRKVLkQdFH1FQu6YKYMOt6ZPKY5CPlmbqJqt87bMOaCIX4sK3lCuICvYzvQ EwmgKwS8g6zESqR4HeKJ5z6B9N9QSinbv/TOVNwG6pevr1eHKe+Xmj7vvO5FdfHK5b 2Cr4Btr59ccKfQ9qCr6eFl3nzfO9yBvAUXM0DD1vOz73DnMng6I+v8C/f2W8GGcA6L IE4tdmDh7FVxg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 734A35C0DA6; Wed, 31 Aug 2022 11:12:11 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, rostedt@goodmis.org, "Paul E. McKenney" Subject: [PATCH rcu 15/25] rcu-tasks: Remove grace-period fast-path rcu-tasks helper Date: Wed, 31 Aug 2022 11:12:00 -0700 Message-Id: <20220831181210.2695080-15-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20220831181207.GA2694717@paulmck-ThinkPad-P17-Gen-1> References: <20220831181207.GA2694717@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org Now that the grace-period fast path can only happen during the pre-scheduler portion of early boot, this fast path can no longer block run-time RCU Tasks and RCU Tasks Trace grace periods. This commit therefore removes the conditional cond_resched_tasks_rcu_qs() invocation. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 03b089184b37e..0ff7d5eaa3761 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3492,8 +3492,6 @@ void synchronize_rcu(void) // which allows reuse of ->gp_seq_polled_snap. rcu_poll_gp_seq_start_unlocked(&rcu_state.gp_seq_polled_snap); rcu_poll_gp_seq_end_unlocked(&rcu_state.gp_seq_polled_snap); - if (rcu_init_invoked()) - cond_resched_tasks_rcu_qs(); return; // Context allows vacuous grace periods. } if (rcu_gp_is_expedited())