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 F32B7501280; Mon, 19 Oct 2026 13:10:27 +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=1792415429; cv=none; b=QiPaXjKvdHqbyhsLnz7ZQDTr4DAp2SWUtkBQcZWuMgg9ohEf9YZKgIONCyxZBNBiU5vzT2u0tLkO2ZkHPHoSJ6vzsJ4mWD6ObfPYFWI4JZAbb/Ld9+hkHoFhOrYpBuM1xutfuRL8S+7iVkoZPwIYSolOtbKkRW8gZi0ajq0Kl3A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415429; c=relaxed/simple; bh=uif8PT5tEvCG6rwn1Vktr0k6x1pfXsbOJFzkYRACYkU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Mj/lEjeWIyWofom/i27UWbfMlKhpcQ7FLU8JD4UpOp048EF23TbVLw4I9uN4jDH4wUMzp6dW1lnZtHC5GlXLviqjm1FDVvtZ5KtQBAjgcaqPlBAvxYze9RzkGCe1LYff8KSXs23BeMbDoGG0QVdY2KLTlM9aEcM2t3q7c/7Irv8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=a2EskNi2; 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="a2EskNi2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 961871F000C5; Mon, 19 Oct 2026 13:10:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415427; bh=bG6NEh8JAP4sj5vYhjog3QoeV7vcUi3tTO8Y/Lh2DHI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=a2EskNi2MF6dghPW+V7nWJaC14Gwn6PwL8SfJXbacESB81hKvB/+RdylsyRPy47D0 qm66EGDmJHJz4r9rDTy4SBrZXwIAROSQ8jsLpUTc0mocF78t/JItk73lB70+lUh5Ls eLbiT7xx9jS0qMJ2Y3Qu7kBK+eNFPwq6GHsOf/ihnfLyz/Ah9ZvNbqBv+yab3gtDCS hxgnDJTjUvvdvffDK2DKT0oRgLwzvqPmHaL/ZsYBm7vKEpIPMW8X82HhFsGghnzcyL KO3dnRBu110oPj/vPizuTHqAl0cxOBJxIkYv0Gjw072FA0jeW8Q5tBKljZRpkgvFea 40AZcwOQX0qyw== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Jonathan Hunter , Marco Crivellari , Peter Zijlstra , Phil Auld , Thierry Reding , Thomas Gleixner , Waiman Long , linux-tegra@vger.kernel.org Subject: [RFC PATCH 29/49] clocksource/drivers/timer-tegra: Move CPUHP_AP_TEGRA_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:36 +0200 Message-ID: <20261019130856.49711-30-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 ba90e385d31f..6377149f6a5e 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_QCOM_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_TEGRA_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_QCOM_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_TEGRA_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0