From patchwork Wed Aug 31 18:12:02 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: 12961251 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 8DD80ECAAD4 for ; Wed, 31 Aug 2022 18:15:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232634AbiHaSPw (ORCPT ); Wed, 31 Aug 2022 14:15:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232635AbiHaSOe (ORCPT ); Wed, 31 Aug 2022 14:14:34 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D109CF14D0; Wed, 31 Aug 2022 11:13:02 -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 ams.source.kernel.org (Postfix) with ESMTPS id 472AFB8227B; Wed, 31 Aug 2022 18:12:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DE8DC43158; 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=eQALP+6nah6BViSpqOqdrb0bckX7LhhhIQ1zzCaGtj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fUw0kg02gBGahufpc1gIh/nb9EO9XNC7nAWI5q7q2vVZnLEvkRjnxf767al2tzBkc q5trO0bg9kzNhL8CVsVxK3i7jAzNVfd4IA3diA8jhGRljGvcLJmcP9B3bYPyWpg55F CYw2DTZVY2ibr4CpqZebAOBEGRfZ/Gx8YK1NW8qBZ0tfOHhBk+5IDDSxfZromczsag GlgnPpZacHM0suz1jrBAD5Hm++vk+xIb2PySR6wI7qMuGe+khV+ErT+afp+DD1+HmF OblFBJu2ts9txXwN1WDKOg3GlmroqXzao84g8m7Yc7aNQkI0oFsIkZKY7r8G+pc8u9 9+JOOJJ6PHasQ== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 76B585C0DF4; 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 17/25] rcu: Remove expedited grace-period fast-path forward-progress helper Date: Wed, 31 Aug 2022 11:12:02 -0700 Message-Id: <20220831181210.2695080-17-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 expedited 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 Trace grace periods. This commit therefore removes the conditional cond_resched() invocation. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree_exp.h | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h index 9c0ae834ef076..1a51f9301ebff 100644 --- a/kernel/rcu/tree_exp.h +++ b/kernel/rcu/tree_exp.h @@ -924,8 +924,6 @@ void synchronize_rcu_expedited(void) // them, which allows reuse of ->gp_seq_polled_exp_snap. rcu_poll_gp_seq_start_unlocked(&rcu_state.gp_seq_polled_exp_snap); rcu_poll_gp_seq_end_unlocked(&rcu_state.gp_seq_polled_exp_snap); - if (rcu_init_invoked()) - cond_resched(); return; // Context allows vacuous grace periods. }