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 8D5C44FD787 for ; Mon, 19 Oct 2026 13:10:13 +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=1792415414; cv=none; b=ktm55ExedA9zrBjZYkG39W4cTrHxnrKK5Hcd+TWvwxxP3YRoWwHy8+LpWP9V2wWM6RPgHEvsg5+P3aU6Z1es9F3zOrrWTkMK8MpVcNmwJdClFr6yZKD1kaTxiU7GVKf5W+D8WovpBMmuUsNb3DvIqiaXniEFShdNQB3kzrzJIZo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415414; c=relaxed/simple; bh=hr7CC2Y6+9UIQuJd2wzdD2Auk+Y+v7QW0d4ptDTmV+M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sf7062BeQRL19R6LveIfMLss8SvSEAs7jOtsOyo+0HTgF8EP9LvqDCB+v+zE7bMIbtQqklrkPZq7edp4bEKgoifHcZHPNfGm0g3JE+Ldx1ehKPzEPKMii5UFleS8IqkHEUen4CBNl+POKpm8Hf2MODvIEhba5oRXyCW7F65241M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=arD8Tfou; 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="arD8Tfou" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 356A61F000C4; Mon, 19 Oct 2026 13:10:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415413; bh=Yb/LHn6YrmdgZdljrcbF7YxTFHXAXRpDPhG81H7HP7M=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=arD8Tfou+Nn5srm0vu5BqKqra8FirHoi8VO58OWbN6bWw3bzWyqXcw4+7R2c2Ps7S uzqeSmRYJ+ONJAqKAbj8SZGcbMcvPF9gUHUH2m2BnA1EMQ9AcK8sF2slwGvSgNVl7q kcCLjlNxKRSJ5YuvcywolQv4rFImtC2YczNq5w+aKgdqW9aQLDrQvUh0o0LB2dtQVn O32n6G2tIiRqb5r/KogvuX5SIQSWpjlZzDgLK7uLyH5aWsTxzHUGg4o0IIACVsgxng PCZL2sHhtH7DKh9rC8HKH8eO3jrXp3FcVLYlg7hNjKHQ6P+rIkTLqS9sep/cy2xGbr KBvHjmEwvpXLw== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marc Zyngier , Marco Crivellari , Mark Rutland , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 23/49] clocksource/drivers/arm_arch_timer: Move CPUHP_AP_ARM_ARCH_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:30 +0200 Message-ID: <20261019130856.49711-24-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(). The teardown callback here simply performs IRQs disablement, which can run concurrently with other CPUs. Move it to post stop_machine() accordingly. 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 27e6542fb6c4..90d37ee0f282 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_EXYNOS4_MCT_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARM_ARCH_TIMER_STARTING); 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_EXYNOS4_MCT_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_ARM_ARCH_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0