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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14D91C2BB1D for ; Fri, 13 Mar 2020 17:47:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E402B20724 for ; Fri, 13 Mar 2020 17:47:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727201AbgCMRr3 (ORCPT ); Fri, 13 Mar 2020 13:47:29 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:47718 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727085AbgCMRrW (ORCPT ); Fri, 13 Mar 2020 13:47:22 -0400 Received: from localhost ([127.0.0.1] helo=flow.W.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1jCoP1-00017r-Bs; Fri, 13 Mar 2020 18:47:19 +0100 From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Ingo Molnar , Will Deacon , "Paul E . McKenney" , Joel Fernandes , Steven Rostedt , Linus Torvalds , Thomas Gleixner , Sebastian Andrzej Siewior Subject: [PATCH 4/9] sched/swait: Prepare usage in completions Date: Fri, 13 Mar 2020 18:46:56 +0100 Message-Id: <20200313174701.148376-5-bigeasy@linutronix.de> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200313174701.148376-1-bigeasy@linutronix.de> References: <20200313174701.148376-1-bigeasy@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner As a preparation to use simple wait queues for completions: - Provide swake_up_all_locked() to support complete_all() - Make __prepare_to_swait() public available This is done to enable the usage of complete() within truly atomic contexts on a PREEMPT_RT enabled kernel. Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior --- kernel/sched/sched.h | 3 +++ kernel/sched/swait.c | 8 +++++++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 9ea647835fd6f..fdc77e7963242 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2492,3 +2492,6 @@ static inline bool is_per_cpu_kthread(struct task_str= uct *p) return true; } #endif + +void swake_up_all_locked(struct swait_queue_head *q); +void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wa= it); diff --git a/kernel/sched/swait.c b/kernel/sched/swait.c index e83a3f8449f65..c528f238c68d6 100644 --- a/kernel/sched/swait.c +++ b/kernel/sched/swait.c @@ -32,6 +32,12 @@ void swake_up_locked(struct swait_queue_head *q) } EXPORT_SYMBOL(swake_up_locked); =20 +void swake_up_all_locked(struct swait_queue_head *q) +{ + while (!list_empty(&q->task_list)) + swake_up_locked(q); +} + void swake_up_one(struct swait_queue_head *q) { unsigned long flags; @@ -69,7 +75,7 @@ void swake_up_all(struct swait_queue_head *q) } EXPORT_SYMBOL(swake_up_all); =20 -static void __prepare_to_swait(struct swait_queue_head *q, struct swait_qu= eue *wait) +void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wa= it) { wait->task =3D current; if (list_empty(&wait->task_list)) --=20 2.25.1