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=1793896345; b=siwkpzyQdLAj3yf0+eeBO1oCWbrBmI4rlxlaLbHyxetAqNYBjOsxuXTpoUaIRgs3T23f hHs7fqWTV2/h/k6/vBdAcxiKwwp2407tv4hfqOj64TGTnPuMI/lShJnoHH/85PwGlGNlv aiNxGq4LrHP8e9mdZDU0w9wUGHwwd8tcQiCrM4KYTVqOavlc9eA1LvyK3jdsRKJRHBDYz EKY/8IwtpkVS2kblMISvZCH6PHzN+pOCM3Xszpb1sSESrMCkap+adjZxeHXQ9mO4T80nb KK4WjWQDCYQjYHuU1C5MThAC8Z9fg1nN9ubZp04NE3IWBGAZJT58DNG9lk7dN5LIYIg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896345; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=kB1qSrsq9dL9glQ48Dry9Uw0Rw0rIyUB1Th14BJXpTQ=; b=HzxJB/ecGvmbv6cmQ8wvvHC3BDd9fm3vBJZMay3Eu/AoqPTaTWem+xll9uAuSbZT4Skk 9izjDM9Gt2MlNR/3ZyxRhogqeyLyXIM6kNnu7/T5lsz4R01rE8XNRMT2BVi2Rco3jowJS mhzNyWNQYqWhRt6tL/4y5Z0AGkkD8eyS1menIREVfGT/q7Z4wE1rpsG1oPOs5i9inC4OF 04qBZ1eYuqhT6TVlXb0iC0Q9Qwad584ls7M3jckwa6owP2eKOZaXeCA6zoSfETuKck22m pnYQx4OnV0ATulhWOWP9Zc/ys13zu9Gb95nRE7CvQi4CcWtyLZSXpIGXn/RDxFOUe7A== 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=AnKFXgO1; 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 698E8606B3D1; Thu, 5 Nov 2026 16:32:25 +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=AnKFXgO1 Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9F091F00919; Thu, 5 Nov 2026 16:32:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896345; bh=kB1qSrsq9dL9glQ48Dry9Uw0Rw0rIyUB1Th14BJXpTQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AnKFXgO1ig/vppU6chuVjQe28C2jBvepgkgfBTiO9OWXpT/3jcFN+MDOX7VO1Xx0G pwg6wdZqh33e0emipvTXTshuXVxFVRLuQ7xOovCq9AeCO7V9Z5oolr76abFznCDSdt Upf99qiUYgo1RV1oSgbV1CSmfqvtQ2M6NqGCSCIWePRywKF2/CgfJU8d7ggqa3WXTk 9dbpyvh/KtS4iFoQ2lDdV6S9THuh2hntiZ6/ILmr5KQppYay3MHraOY2h0kADtDuBl qBkvkCtyPi0aOTihXZAxke0qmlceed/EkdeKb5Oy6GNB/TfYAwfvMCD+LCaRT2IYry /uDg/eryysgUw== 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, "Paul E. McKenney" Subject: [PATCH 29/47] clocksource/drivers/timer-tegra: Move CPUHP_AP_TEGRA_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:27 +0100 Message-ID: <20261105163045.38862-30-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 fc29c33a03e1..27acdd9800cf 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