From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793896343; b=V6Pph30iKaaxQWgJPEHEYiRs3SND+bPn6ow3aEtc5yPJ4l/6D4heP+Qnj1O7H9HREUtz I7RubO/WicvWgYUzp6rOlK8n3lJONCeQ9X2uKF2AHePEZ47496cKszwVkFfnBav4bTlOI MhFS+f5Xjc5Abv1+NnhQZwsCTtuygQ4mGKnuuR/dRaXpu/i41mPiaIFkOoTWT8YbJGLOe QO3HTiAwaI4rwSXLSjoV1cAwJGaOEax7cwKNVSNskPdeJ6osq5g/vHJLA0hN8/GDZVAGy 88gan6+5S5g66v7FMZ5OqT/OEdVLh8kwceItvyXh5TuETTkA5HD4hbjo8lq8ANmJooQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896343; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=tXXo53fMoAv9ArU0UJIQnmlggvFijz+IsVNz2/Uo7rg=; b=JsvP7NsO5OI0eOagUElVbA7/ELZMj9E3YRVuQqNlLYeEZZipL+zy0nrLaQ8rx7+jfrdH 5sISyagdzpidXwp7xoV7Fmelao8e0SrLEnM/ozZ73lmCEFAlPZBU9I3jyCFQPgDHA0MgF Jnjf1DtUVMf8xPtWw0YCNtFIcueUzvPBBJf+zxr877IFIU3uYB+jyRLZ557aua8gqJz8v 3dq0pyGyEjKKn47S/78YqtUU11uZiSsxk5ICpzF3ffTubxh9I8byK1WTlNwxu4i8h94cV Z8dbYBB8prZ4Zi04vzH1DtE2Txo5OfI4JBy2qCvH+oSgBjfcUqo3iEeHHa3Cxcvj21g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="I/HS+L8O"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6771606B3C5; Thu, 5 Nov 2026 16:32:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=I/HS+L8O Received: by smtp.kernel.org (Postfix) with ESMTPSA id 587071F000C1; Thu, 5 Nov 2026 16:32:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896342; bh=tXXo53fMoAv9ArU0UJIQnmlggvFijz+IsVNz2/Uo7rg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=I/HS+L8ObJu/swOkvWfPEFiUe5hnsfwSlohdD346fvUP6gfPmzKAhD2ymKnT+SpUa hfLaK5CYuda6G8v/ULfu0Utdjl7GeCi0/mhQlA9D9nnNPxV9a/97HOCfe1NINm2cMN 0lfJU9/Ao7Qe8VmzvsiaL23M138Ud8lnE5z5mKwiQ9ZxeiHKzG5w/wlcNwkDiyNHB3 KxSQwJ7FR30j8ZeYyLLt2ApXLjdJp1PCzLUUSM/VyekAIlB9fmbYfYw3+T+OYLcUAK JPKEq93iRrfe91CC4t3QJ4Hj7DxwDlceChT49FNkfJDplDr3qh2b/K7dbJ8kgWpJLM A8HAQXIMTUNTA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , linux-arm-msm@vger.kernel.org, "Paul E. McKenney" Subject: [PATCH 28/47] clocksource/drivers/qcom: Move CPUHP_AP_QCOM_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:26 +0100 Message-ID: <20261105163045.38862-29-frederic@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261105163045.38862-1-frederic@kernel.org> References: <20261105163045.38862-1-frederic@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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 d7a6dcb14885..fc29c33a03e1 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_ARM_TWD_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_QCOM_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_ARM_TWD_STARTING); + WARN_ON(st->state != CPUHP_AP_QCOM_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0