From patchwork Thu Oct 21 12:01:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Cai,Huoqing" X-Patchwork-Id: 12574823 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81D9BC4332F for ; Thu, 21 Oct 2021 12:01:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69EBC61362 for ; Thu, 21 Oct 2021 12:01:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231197AbhJUMEK (ORCPT ); Thu, 21 Oct 2021 08:04:10 -0400 Received: from mx24.baidu.com ([111.206.215.185]:42282 "EHLO baidu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230340AbhJUMEI (ORCPT ); Thu, 21 Oct 2021 08:04:08 -0400 Received: from BC-Mail-Ex12.internal.baidu.com (unknown [172.31.51.52]) by Forcepoint Email with ESMTPS id 6A62C8AEA37A7E74DBA6; Thu, 21 Oct 2021 20:01:46 +0800 (CST) Received: from BJHW-MAIL-EX27.internal.baidu.com (10.127.64.42) by BC-Mail-Ex12.internal.baidu.com (172.31.51.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2242.12; Thu, 21 Oct 2021 20:01:46 +0800 Received: from LAPTOP-UKSR4ENP.internal.baidu.com (172.31.63.8) by BJHW-MAIL-EX27.internal.baidu.com (10.127.64.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Thu, 21 Oct 2021 20:01:44 +0800 From: Cai Huoqing To: CC: Bernard Metzler , Doug Ledford , Jason Gunthorpe , Davidlohr Bueso , "Paul E. McKenney" , Josh Triplett , "Steven Rostedt" , Mathieu Desnoyers , Lai Jiangshan , Joel Fernandes , Ingo Molnar , Daniel Bristot de Oliveira , , , Subject: [PATCH 1/6] kthread: Add the helper macro kthread_run_on_cpu() Date: Thu, 21 Oct 2021 20:01:30 +0800 Message-ID: <20211021120135.3003-2-caihuoqing@baidu.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211021120135.3003-1-caihuoqing@baidu.com> References: <20211021120135.3003-1-caihuoqing@baidu.com> MIME-Version: 1.0 X-Originating-IP: [172.31.63.8] X-ClientProxiedBy: BC-Mail-EX04.internal.baidu.com (172.31.51.44) To BJHW-MAIL-EX27.internal.baidu.com (10.127.64.42) Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org the helper macro kthread_run_on_cpu() inculdes kthread_create_on_cpu/wake_up_process(). In some cases, use kthread_run_on_cpu() directly instead of kthread_create_on_node/kthread_bind/wake_up_process() or kthread_create_on_cpu/wake_up_process() or kthreadd_create/kthread_bind/wake_up_process() to simplify the code. Signed-off-by: Cai Huoqing --- include/linux/kthread.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/include/linux/kthread.h b/include/linux/kthread.h index 346b0f269161..dfd125523aa9 100644 --- a/include/linux/kthread.h +++ b/include/linux/kthread.h @@ -56,6 +56,28 @@ bool kthread_is_per_cpu(struct task_struct *k); __k; \ }) +/** + * kthread_run_on_cpu - create and wake a cpu bound thread. + * @threadfn: the function to run until signal_pending(current). + * @data: data ptr for @threadfn. + * @cpu: The cpu on which the thread should be bound, + * @namefmt: printf-style name for the thread. Format is restricted + * to "name.*%u". Code fills in cpu number. + * + * Description: Convenient wrapper for kthread_create_on_node() + * followed by wake_up_process(). Returns the kthread or + * ERR_PTR(-ENOMEM). + */ +#define kthread_run_on_cpu(threadfn, data, cpu, namefmt) \ +({ \ + struct task_struct *__k \ + = kthread_create_on_cpu(threadfn, data, cpu_to_node(cpu), \ + namefmt); \ + if (!IS_ERR(__k)) \ + wake_up_process(__k); \ + __k; \ +}) + void free_kthread_struct(struct task_struct *k); void kthread_bind(struct task_struct *k, unsigned int cpu); void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);