Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932557Ab3HGKWz (ORCPT ); Wed, 7 Aug 2013 06:22:55 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:55306 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S932404Ab3HGKVB (ORCPT ); Wed, 7 Aug 2013 06:21:01 -0400 X-IronPort-AV: E=Sophos;i="4.89,832,1367942400"; d="scan'208";a="8143905" From: Lai Jiangshan To: "Paul E. McKenney" , Steven Rostedt , Peter Zijlstra , linux-kernel@vger.kernel.org Cc: Lai Jiangshan , Dipankar Sarma Subject: [PATCH 2/8] rcu: remove irq/softirq context check in rcu_read_unlock_special() Date: Wed, 7 Aug 2013 18:24:58 +0800 Message-Id: <1375871104-10688-3-git-send-email-laijs@cn.fujitsu.com> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1375871104-10688-1-git-send-email-laijs@cn.fujitsu.com> References: <1375871104-10688-1-git-send-email-laijs@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/08/07 18:19:35, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/08/07 18:19:36, Serialize complete at 2013/08/07 18:19:36 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1133 Lines: 34 After patch 10f39bb1, "special & RCU_READ_UNLOCK_BLOCKED" can't be true in irq nor softirq.(due to RCU_READ_UNLOCK_BLOCKED can only be set when preemption) Signed-off-by: Lai Jiangshan --- kernel/rcutree_plugin.h | 6 ------ 1 files changed, 0 insertions(+), 6 deletions(-) diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 8fd947e..54f7e45 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -361,12 +361,6 @@ void rcu_read_unlock_special(struct task_struct *t) rcu_preempt_qs(smp_processor_id()); } - /* Hardware IRQ handlers cannot block. */ - if (in_irq() || in_serving_softirq()) { - local_irq_restore(flags); - return; - } - /* Clean up if blocked during RCU read-side critical section. */ if (special & RCU_READ_UNLOCK_BLOCKED) { t->rcu_read_unlock_special &= ~RCU_READ_UNLOCK_BLOCKED; -- 1.7.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/