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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CDA2DCCF2DB for ; Mon, 19 Oct 2026 13:11:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Rzj8BT/yawvlFvWiKgY7YWEOrf8AruxVG6QySahLhSk=; b=x3J24fB9A6nztEHhnkE1TuCFAQ SHuE4cqVn4QU32a9SXIPBPu1YAq6ennsWM9ubgOsexIK+INkiDIBoXNmszzuIZm2SS58odh0x2TLQ kJF28sl0PhQVpDcANzhwQjuHDxMZU404/WxPei/fX4fkIvkprAOaQP45ycU/KU0QCEp1mtiRW0CwD aW77uy8fb9a7HSvPkdjd0x+4/t48TmyK8bQcrOGhmOTeOu40NkGBAKXg/Q7HpRMN2XivpgugYaUL3 e5gBU8IdgsPcYC3Cme1KVVd9aEk+PTRMxKM+Ge75WHSrOsz1eTAi/G1TIJxcJUzlDztzCu2ObMik4 WhWw5rMQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xIn95-00000007U43-19sL; Mon, 19 Oct 2026 13:11:19 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xIn94-00000007U3B-1icM for linux-arm-kernel@lists.infradead.org; Mon, 19 Oct 2026 13:11:18 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id D40266020A; Mon, 19 Oct 2026 13:11:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 332541F000C4; Mon, 19 Oct 2026 13:11:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415477; bh=Rzj8BT/yawvlFvWiKgY7YWEOrf8AruxVG6QySahLhSk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fFrdQ4ZBvqImuWldbCFDLDLKbl3TWVVr/rHfINDcsOZRggF0LXKDHBvzkLErT8zzV KF6ryk/CTVKV9vUM/nLP5LH+es/yX43fP8l02r/o4eKOV24Q5JVn63WmQcWt1oPA0P Ibm/hw4lfaX8TdRYAu3yusIM1IRIIkyFbEDYCmpldhC5VK3zZCTtMy7OClZXtpZS6n Tki3CGAQEYrCd6ZAjThgbybkptMXqQyXc9K2pqd3/ESnRTi6YwftymrmON/qJUKHZE CI0szDe0UVmqswwX0ibh90I4nDUzv2CapfP4fFIPJBD3M2QocoPt5AV129SUsa+RUX +hMmEDQBwir7w== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Broadcom internal kernel review list , Florian Fainelli , Marco Crivellari , Peter Zijlstra , Phil Auld , Russell King , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 49/49] ARM: mm: Move CPUHP_AP_ARM_CACHE_B15_RAC_DYING post stop_machine() Date: Mon, 19 Oct 2026 15:08:56 +0200 Message-ID: <20261019130856.49711-50-frederic@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261019130856.49711-1-frederic@kernel.org> References: <20261019130856.49711-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Between CPUHP_TEARDOWN_CPU and CPUHP_AP_OFFLINE, stop_machine executes all the teardown callbacks while stopping all CPUs in the system. This doesn't mix-up well with running RT or isolated tasks. In order to transition smoothly from global stop_machine to finer grained synchronization between teardown callbacks and the other CPUs, a new stop machine post function has been introduced to be executed after the main one with IRQs still disabled while other CPUs can exit stop_machine(). It *looks ok* to disable the cache readahead globally while the other CPUs are running. Move this teardown callback to post stop_machine() accordingly. But please double check. Signed-off-by: Frederic Weisbecker --- kernel/cpu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index 87680f7c6493..36f8e6588196 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1275,7 +1275,7 @@ void clear_tasks_mm_cpumask(int cpu) static int take_cpu_down(void *_param) { struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); - enum cpuhp_state target = max((int)st->target, CPUHP_AP_X86_TBOOT_DYING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ONLINE); int err, cpu = smp_processor_id(); /* Ensure this CPU doesn't handle any more interrupts. */ @@ -1303,7 +1303,7 @@ static int take_cpu_down_post(void *_param) enum cpuhp_state target = max((int)st->target, CPUHP_AP_OFFLINE); int cpu = smp_processor_id(); - WARN_ON(st->state != CPUHP_AP_X86_TBOOT_DYING); + WARN_ON(st->state != CPUHP_AP_ONLINE); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0