From patchwork Mon Dec 28 12:46:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 354405 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 952FAC432C3 for ; Mon, 28 Dec 2020 16:11:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EE4D20719 for ; Mon, 28 Dec 2020 16:11:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393594AbgL1QLg (ORCPT ); Mon, 28 Dec 2020 11:11:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:50950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388346AbgL1NWs (ORCPT ); Mon, 28 Dec 2020 08:22:48 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id CC680207F7; Mon, 28 Dec 2020 13:22:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609161752; bh=k4LNBYdqcC/d4phPKsQg+G+/GSM6jXgB1CblEQV7WeI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OM7aJA01wrrbShJ/UWLGKrys9zVkOcgbUKU15YS5stip3mjOBTO3VYrRXHQtdOlr8 TPdnLRAn9yCkaSJDHqyCQR6jldjJYPDJlDz+UnOBiKvIotJhid76iqSLWOFaa4lL9Z v/vdjLaolLpGVE3xE0uSflJ4WLahKzWl1VDd+cE8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicholas Piggin , "Aneesh Kumar K.V" , "Peter Zijlstra (Intel)" , Michael Ellerman , Sasha Levin Subject: [PATCH 4.19 070/346] kernel/cpu: add arch override for clear_tasks_mm_cpumask() mm handling Date: Mon, 28 Dec 2020 13:46:29 +0100 Message-Id: <20201228124923.178774895@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124919.745526410@linuxfoundation.org> References: <20201228124919.745526410@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nicholas Piggin [ Upstream commit 8ff00399b153440c1c83e20c43020385b416415b ] powerpc/64s keeps a counter in the mm which counts bits set in mm_cpumask as well as other things. This means it can't use generic code to clear bits out of the mask and doesn't adjust the arch specific counter. Add an arch override that allows powerpc/64s to use clear_tasks_mm_cpumask(). Signed-off-by: Nicholas Piggin Reviewed-by: Aneesh Kumar K.V Acked-by: Peter Zijlstra (Intel) Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201126102530.691335-4-npiggin@gmail.com Signed-off-by: Sasha Levin --- kernel/cpu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index 08b9d6ba0807f..9a39a24f60253 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -776,6 +776,10 @@ void __init cpuhp_threads_init(void) } #ifdef CONFIG_HOTPLUG_CPU +#ifndef arch_clear_mm_cpumask_cpu +#define arch_clear_mm_cpumask_cpu(cpu, mm) cpumask_clear_cpu(cpu, mm_cpumask(mm)) +#endif + /** * clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU * @cpu: a CPU id @@ -811,7 +815,7 @@ void clear_tasks_mm_cpumask(int cpu) t = find_lock_task_mm(p); if (!t) continue; - cpumask_clear_cpu(cpu, mm_cpumask(t->mm)); + arch_clear_mm_cpumask_cpu(cpu, t->mm); task_unlock(t); } rcu_read_unlock();