From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A38894E5346 for ; Mon, 19 Oct 2026 13:11:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415478; cv=none; b=aiVBh5kwkDchwJTQwfcwyhYpg3DHWQOMddmvfom/YRk+r0CF90kyhPi9MKQ00BNg5TcGQrC8Fa9iggGfgRL9SuIX005KjFbvTW1/BXy7SVfWieRCk1Jj116olo7J5VfY15jKmCv5VwpkLvK67SFQgDlTDrXdIxFARyU0/XnETEM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415478; c=relaxed/simple; bh=NXB/UvlufA9tj1LDZR18dS+cHNP0I/0EenzwMgUn5Kc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TrKcvuRteh6UMnkBBby3hyo3i5t7jASyL0JpObNDfa6x/1fvyijeR1Wh5+FpDs1+hwbc/Uq/bhwZgR90CTBFyXmD70sG1Yb0k8leHNfNWoZ3LcUkgoB1MRUXchL1QW3mcTGrspoeUmK1zD4n/RmxRwr45QEUFr7kp08oqnBVKFo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fFrdQ4ZB; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fFrdQ4ZB" 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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