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 8639FC433FE for ; Fri, 28 Jan 2022 03:13:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345650AbiA1DNc (ORCPT ); Thu, 27 Jan 2022 22:13:32 -0500 Received: from mga17.intel.com ([192.55.52.151]:39938 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242230AbiA1DN3 (ORCPT ); Thu, 27 Jan 2022 22:13:29 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1643339609; x=1674875609; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=/LmCgpYiJBrJsf8AATV8fsiaEKrBmaCM1obCwdAjp24=; b=ecZKNutFLqH5p/zslw1Qndt2PDsBFFB6fIBpvTSE5s+oFk0fb5M8+EZJ X7EItUo+JTDD8N/6Q5ytRhz9GSHk9/ik7KLISoaUEATcEKdbRmSJl+nDd S1Dt8Xh/WQDjtVOEdUCyJFGmEjHdcJRhb3/M4sDqR3J3qhhabV0uJHy99 x/N0R6F2fApHOuUgTxYt7pe55aL4I2nfNpJpGPV075UB12NFEDz68xYZX 4tTjviLvWumHRtH8wHLZ1kY+/gvaGIPOKbWZVOXcs/HJLwg6rWdFdM421 fLCk+iXknJgnLQiAEOiXJEIb56rbYxlXT3SyVyKjpusFtGA8AGzPtMjwu w==; X-IronPort-AV: E=McAfee;i="6200,9189,10240"; a="227702447" X-IronPort-AV: E=Sophos;i="5.88,322,1635231600"; d="scan'208";a="227702447" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2022 19:13:29 -0800 X-IronPort-AV: E=Sophos;i="5.88,322,1635231600"; d="scan'208";a="535960378" Received: from zq-optiplex-7090.bj.intel.com ([10.238.156.125]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2022 19:13:27 -0800 From: Zqiang To: paulmck@kernel.org, frederic@kernel.org Cc: linux-kernel@vger.kernel.org, qiang1.zhang@intel.com Subject: [PATCH] rcu: When rcuog kthreads is in polling mode, wakeup waitqueue is not requried Date: Fri, 28 Jan 2022 11:13:46 +0800 Message-Id: <20220128031346.157961-1-qiang1.zhang@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When grace period cleanup, the rcuog kthreads that waiting in sq waitqueue will be awakened, however if the 'rcu_nocb_poll' is set, the sq waitqueue always empty, so if 'rcu_nocb_poll' is set, return directly. Signed-off-by: Zqiang --- kernel/rcu/tree_nocb.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index 636d0546a4e9..9e106c590e56 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -201,6 +201,8 @@ static void rcu_lockdep_assert_cblist_protected(struct rcu_data *rdp) */ static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq) { + if (rcu_nocb_poll) + return; swake_up_all(sq); } -- 2.25.1