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 764394F96AD for ; Mon, 19 Oct 2026 13:10:46 +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=1792415447; cv=none; b=CmRRUc0TcoqEs4H8YMtwtNjMinWaEsFsn9/3+IH3xcTauTwPsflTE5qufFXEHw55dX0nV+Pz9z6OiA6BRIfm3O1u39TTtiPgSzlesoqWdEQ/ndDzB6R06etWU0YagUwcW2TzUN9HEvrykUcDaidfE4KqWBPaG19ZUeGi722ia9U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415447; c=relaxed/simple; bh=5EzxrmdgmqQ9Iew00WRgtRfDA7oqqYB7YYsMO65ww4g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oKQ290U1HS614j0o2wJiDCADjh651UDKzUvYsH80gSgaHnrJWA2vsz8hWyQWIJ/ClEY/2193A5TYX0OWmnzhtNcJT88K/ySF0prrsRfIXiGub9IjqRGJ/gQF3hXK/0HrtqLPcMNEltVpReTVRuWN3Wvf6gslAK80syF3AQoDxIQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NMd05uaa; 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="NMd05uaa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 596E21F000C4; Mon, 19 Oct 2026 13:10:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415446; bh=cHFewh0wcyttEz9ahpNHnLuhwWl7Z9G2VM94SDy1lsk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=NMd05uaauLu9V8d8z8nwRBeM8iidHey9WAmBgX5YD7/yrJju2x861SZB5PF4Feuyr NlSjkSyyg+AHO9gGRE1WBHFXCFzQ/25PLYGC9JbdrE4V/x7Dt+q2vLLqFIMYnjDf46 kTw5HHJHusj2mLJ7tOdF+QN36XNap/27TcK7M1/kmG7fy1Qq0S+orp8YEQgQDLJm+r VRh4pX/7fSO4SeTJuYekHXFUpqg0NYGNBsHecFWbikApHunEDYE28Y13Lo4DIzXPim oIw5gn6On8KhIMCws6vwBsH9UAf0oPx7oP3DQzdJE5ciKYNJQ2oc1LePiwOlo/9xVK Q8aP/Ecc7TYLQ== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long Subject: [RFC PATCH 36/49] clocksource: clint: Move CPUHP_AP_CLINT_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:43 +0200 Message-ID: <20261019130856.49711-37-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 IRQ 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 c2f25b6f72a4..9735d6cd01d8 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_RISCV_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_CLINT_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_RISCV_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_CLINT_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0