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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 666EDC433DF for ; Wed, 27 May 2020 14:29:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3412920C09 for ; Wed, 27 May 2020 14:29:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590589760; bh=OaAVBBewm6BZDZCoIu2UlgLgiBkFjNnLDhJvBL1agRQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZaY+6sjC3hkfVheF0YkpufA7uLBp6VJAy8BMbzNyHrQ5BYyvZyFEngaVk4GHkxMyy U4zUh+TZ0Ed1mCtIAQ534m8yjUMO6AI43PpreS2V7Ae41pF76RJosNRPx6dQK7+n1n yDJ/TPDeKKP+3/QX4uzPpBY9kkKfLKIWPq5zlg2Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389241AbgE0O3T (ORCPT ); Wed, 27 May 2020 10:29:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:37320 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389185AbgE0O3S (ORCPT ); Wed, 27 May 2020 10:29:18 -0400 Received: from lenoir.home (lfbn-ncy-1-324-171.w83-196.abo.wanadoo.fr [83.196.159.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0E159208C3; Wed, 27 May 2020 14:29:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590589757; bh=OaAVBBewm6BZDZCoIu2UlgLgiBkFjNnLDhJvBL1agRQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MKXXcG488byB5Zxnm85C7o5H2EyNr1fAroH1ILEbTlDP+ZAAkS0eXG6mwfyScLvLZ BgbYaroEJyD0jCuXmbjrzdapDf0JHAwkWPAjohOz9AUA8ZUOs/PdAIiuEBBJFVlLba f1gEL2XurbvbUyI2qwsnkRl6eAEw+GrJkBhmbWKw= From: Frederic Weisbecker To: Peter Zijlstra , Ingo Molnar Cc: LKML , Marcelo Tosatti , Frederic Weisbecker , Thomas Gleixner , Andrew Morton , Christoph Lameter , Chris Friesen , Jim Somerville Subject: [PATCH 1/2] kthread: Switch to cpu_possible_mask Date: Wed, 27 May 2020 16:29:08 +0200 Message-Id: <20200527142909.23372-2-frederic@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527142909.23372-1-frederic@kernel.org> References: <20200527142909.23372-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marcelo Tosatti Next patch will switch unbound kernel threads mask to housekeeping_cpumask(), a subset of cpu_possible_mask. So in order to ease bisection, lets first switch kthreads default affinity from cpu_all_mask to cpu_possible_mask. It looks safe to do so as cpu_possible_mask seem to be initialized at setup_arch() time, way before kthreadd is created. Suggested-by: Frederic Weisbecker Signed-off-by: Marcelo Tosatti Cc: Chris Friesen Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Andrew Morton Cc: Jim Somerville Cc: Christoph Lameter Signed-off-by: Frederic Weisbecker --- kernel/kthread.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/kthread.c b/kernel/kthread.c index bfbfa481be3a..788bec94aca7 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -360,7 +360,7 @@ struct task_struct *__kthread_create_on_node(int (*threadfn)(void *data), * The kernel thread should not inherit these properties. */ sched_setscheduler_nocheck(task, SCHED_NORMAL, ¶m); - set_cpus_allowed_ptr(task, cpu_all_mask); + set_cpus_allowed_ptr(task, cpu_possible_mask); } kfree(create); return task; @@ -585,7 +585,7 @@ int kthreadd(void *unused) /* Setup a clean context for our children to inherit. */ set_task_comm(tsk, "kthreadd"); ignore_signals(tsk); - set_cpus_allowed_ptr(tsk, cpu_all_mask); + set_cpus_allowed_ptr(tsk, cpu_possible_mask); set_mems_allowed(node_states[N_MEMORY]); current->flags |= PF_NOFREEZE; -- 2.26.2