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 272994F5E1E for ; Mon, 19 Oct 2026 13:10:38 +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=1792415440; cv=none; b=bbaLb/DOLsv4I+ag5NKS1bcIMMvaIsN525aPsYJcg0q2Y2LEC4M+ZXXCI7g//lYWovxfxYNMXFjU54Fwu+pGXT/XSxsVUa3pvCy10KqLA27xxrl0QkaoUqusikNDxqrNuCeoY/enIyk1p7G4ZudbiaSjn5EbDhI/CpNEcCTm0Kg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415440; c=relaxed/simple; bh=D8O9OxDj9SoE2U2/d2b0vrh94CcCnuwsJepxgRj+M70=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eA6NbonJeV7tcPJ1WgzvsxC400xnCzggDRJ22rhkmgRyfDepfLY9vtJkWn2QC9t2hhH8tuhxiDXRmOZuHIsyEZnvAcZYFOOsAQW5H3Uc1yzcTToXu2lbIg3wCMLU/yDgKVRMEGSgolFubwe32NSk3lzZK1JFzMRUYPcKYImyJQo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Kt/sI9Tb; 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="Kt/sI9Tb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 429C31F000C5; Mon, 19 Oct 2026 13:10:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415438; bh=vushEdhWRPUWLc74YEYtHFujgyQzRnNdW4KguK0R+2Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Kt/sI9Tb67Dw/vkigmU/TMkei4jpYI0kqUNCilROCjm1OZDJVyo6AGkB2VPcfpFXw mx8t07U1IEShXLuvkt9IHpO5vAvofXngJcgWEClnoeHG8xDtrCsQ+bWO3DKCemCMvQ PpulC/n1w/j0kPahwvOF8x2fgkop7opRwGMIUOiDm0pp0XbcX2BhCwM39aaFfRaKyO 9rGE+XoVfHJTugREZIJgNg0ymRIyrEsgGlZ13Oled/w2B3H/1GUBJysRAzWl7IAheq O6gq+ClXDTa37VqUzdCnKMy9wYZuhPOq7VL7Gq5iOwx6E12WsHJU/17PXyIoEm+o5K ebVL6Vmf9+kJA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Vineet Gupta , Waiman Long , linux-snps-arc@lists.infradead.org Subject: [RFC PATCH 33/49] clocksource/drivers/arc_timer: Move CPUHP_AP_ARC_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:40 +0200 Message-ID: <20261019130856.49711-34-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 e648df00c6c1..75f4cae8971e 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_MIPS_GIC_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARC_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_MIPS_GIC_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_ARC_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0