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 AC8944F85A5; Mon, 19 Oct 2026 13:09:30 +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=1792415371; cv=none; b=IDy/BcgJqKPSBwOQwPmAvG/vu1lz8nCB/JEJYyu2pY2ksKRo/SCVWtnWIB1OT/K76hkwXAqzEehQWjdkfmJ6WGDqGWi5LCQoMHZngL6mEGTVwVpwhNGSn6ZHlU2MT5WkFb6q6NU4wQycZ02ROkHMed6ZKdQjvFbnZfGCZFq9vqg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415371; c=relaxed/simple; bh=Utnpvdca2ld45brPZnbhWXKaUoebuFSR0e/DoKYLf1w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NpN5JC9qdwnoqhwpPUKI2xLlo7TkjTScLv4Nhzzugmnl2fCOy2XbV5uMBulKEKWjmuBd9z4Q8EvjtqF1cS+eXpsU48fXgVJtArYTSjLrd/ePB37I5PHbUrLfal2pWR7gKyHUO4hPjneTbqXdxyV0ktnMY/ZU+o4tDdHtPhpiqt0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lT1v1BTD; 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="lT1v1BTD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D45B31F000C5; Mon, 19 Oct 2026 13:09:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415370; bh=ACXR4c/mJG0yyltIesQbqalC0iUpeF1uXq6xWutv6LU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=lT1v1BTDSYJKHRFHDJ2wGYaBX5Vwm7bKsSRA/2YXcn9sYNGNsmlmvLKagoizaS8GT XDuATyFV9h5pg6lBj5NqsEv7LLVZDna20vI4lPjBA0A4eBlpEmqwMVMxAqI9Z7Ja0M V/rB/ESm1nX12FaKKuqOdOPITZO+9cerseKaPYkrFZ/DRMWETCKTY39iLsmOi/JuPf lRlWPflQzWRra5ez8qypSiT3ssjZ3oEFHP0oimSY6F8l42AhghZcNDdGUMBi4ItiZQ 4XUoRp4GwprtHbMJrWH+oG4wJBctUvaVL1ML+DKvoy5pd4MREjl29qGjeGJn+4rub2 9TCqQyF13d7Zg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Huacai Chen , Marco Crivellari , Peter Zijlstra , Phil Auld , Radu Rendec , Thomas Gleixner , WANG Xuerui , Waiman Long , loongarch@lists.linux.dev Subject: [RFC PATCH 09/49] irqchip/loongarch-avec: Move CPUHP_AP_IRQ_AVECINTC_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:16 +0200 Message-ID: <20261019130856.49711-10-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(). avecintc_cpu_offline() can run concurrently with other CPUs because loongarch_avec.vector_matrix protects the internal structures. Move this teardown callback 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 126896b2c970..f32404821731 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_EIOINTC_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_IRQ_AVECINTC_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_EIOINTC_STARTING); + WARN_ON(st->state != CPUHP_AP_IRQ_AVECINTC_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0