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 D65414E4303 for ; Mon, 19 Oct 2026 13:09:25 +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=1792415366; cv=none; b=TlbFCFVaTuOmSRZmffcP475uCFi098I74pDbGe2eVtPuvN/MBL/ukaGd6FWJU8lsltCHtuO4Yw4Es36QL04sp7zKr/mnhURMFengrFgqgUz8jQQdGwzp0VgzoJSmB0yaEJJsoyUbYkp/XuMSprIp+43nwBvjzGGVsefAhWTR+gU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415366; c=relaxed/simple; bh=DqL3cOEHfXzrxIJubV/T8jeWpB8JEOyAvV8CsHOA650=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=T/xXCvqBKhdfz9TtM1+DJeuTnn/d2ks2/7ljr3StQofDKnMi0eM190AQJHEtjvU2ikXW6PTp/2hPhZH8WeMK57DuLh+MlRnZFC4G9V3mKwMR4sJQPd3rbihNkp2JHJtLyh1paKqwtLnTyZVJkDZb6ry5pdvXh+sf/UsyUuAj5hU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IrrEwIPs; 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="IrrEwIPs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 398F11F000C5; Mon, 19 Oct 2026 13:09:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415365; bh=pqM9t0QqCSFH/hDkrc9NQbwTDyDkgEma6dueNWHdCeg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IrrEwIPsVZnzJp3zS9x+Uh9zwGzLiG+zBk0L8icLzpIwY8/YaS9H42g4kTn9+/WIf w9JJzZq2re9f3PtRGkcZOtUmCFgKJOmdEKehHNNyvODJp+zWkwF07fniywnhHzNF1Y DGUtdKB9JqaNssu2HkT9vc9C3fA9owLUdRjme+pswVsWs42nAAwc7/mYdZ16i+tLv4 3qs8+CpvOGDUuA1UvA3KTGAfQi6Z1Os+1hhrjfyhEwp39L9tWPgD0sLY0W8WnqAOXn 4ky72Z30InNOVlunBIRE7edNkGhRyluTqMPnmFlz92kKklNJVD0ucpB39c9mtRltBa XadtmrJS1jFlg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Broadcom internal kernel review list , Florian Fainelli , Marco Crivellari , Peter Zijlstra , Phil Auld , Radu Rendec , Ray Jui , Scott Branden , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org Subject: [RFC PATCH 07/49] irqchip/bcm2836: Move CPUHP_AP_IRQ_BCM2836_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:14 +0200 Message-ID: <20261019130856.49711-8-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 just masks the per-cpu IRQ in the chip and shouldn't race 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 293dbb73d940..db73cdfbf1d0 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_IRQ_ARMADA_XP_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_IRQ_BCM2836_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_IRQ_ARMADA_XP_STARTING); + WARN_ON(st->state != CPUHP_AP_IRQ_BCM2836_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0