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=1793896375; b=VUebB5CwybO8ULf8jYNv3Vnf4cnG1Il+2wKITooDlrFVPLm8piuHcGgd6p1V+O0VuQky sQWt2wB3BMEh3d+nj2gnPNDgWjax5BjSExvCd4nNicqVFZLdXljT9xvck0IZ4ylwfsSPQ 5vTa2gJzkHrVdgbhIOcrPCJ0mlcPgKP/L1YpXC07sUn8rhQNK+LR2ehGM70HahlfzESp9 tDRfsawzV180yA0OPy5StcpDu4docCVLQpjeg5L8ytlV1X5V2Ubr9GrS0zfD0U63R2iZ4 PpNeIztdLv4PANCK8CZ0t5zKoiwjnQQv0TgvgJn4deuifwiHaGegF/Ua5ABnXXug5tg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896375; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=kg5bErG9AdTDiRitVVVlJkekm9pYQshPoKcKiS8xeto=; b=zpTnt6hxcF81V1WUNyt+FTRNuG4W6dP1oGZfPy+2dg0C68NC5kg2/1WzKkogcrmG0ssS 9R/Wx1RHFRnS01y9wb0G68r8YlkYw6WyOA7LCZvnGqYW0Z7/FMe3MlD/PSnDH7aCVNkc8 MObD+RDlQb5LBzfjcrF6+NBg2gD26f2bWbIs1Ivc6z2/Kn7JyP6BVovbLbh66ejsysp13 HP0dBjbO8b389mO1tuhFte44+lch+CrQsGeR0JlfIEndaK9FLwYlQNUOmjDeaFublWprP zBs4lNQ76pwIh7s+QvJn3gItep/DSB0K7RSjwLPBRYvf1MO2z4oSZPiwD9exod9jtcA== 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=R1rSf1o7; 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 2777F606D735; Thu, 5 Nov 2026 16:32:54 +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=R1rSf1o7 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 81CD21F0093A; Thu, 5 Nov 2026 16:32:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896374; bh=kg5bErG9AdTDiRitVVVlJkekm9pYQshPoKcKiS8xeto=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=R1rSf1o7yeWlzS7LhIqvjlNIs4Rf6OhQO6DI8S0nmWJ7whO3aE1NptEDEgSV9C92V I9ZAF0EjAIhUhLqiygNPwIZEzGDRa8+/IHevpDgNQI0LoKdEIdPd+sDmM5HOFcRJGo JaPkRvCaLdq918Q9xHuWEVFC11mdis1HrX0dFJvLxPOMsWBnVIhyTCMxbgHRbPRCNa 1Rw4G+6+RIglH98Mw9WAUa2QIkEojlI1dlAlYJNAOkwUnhwfjXM6SShddDf2sOhWis +wEKsa1vTQlc8FAQsWqkyiOijqCjBPcJYsrl8w88wU9VesHMkkeA/rSYNLlaClXs0p TPfEaKTT02bqQ== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , "K. Y. Srinivasan" , Daniel Lezcano , Dexuan Cui , Haiyang Zhang , Long Li , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , Wei Liu , linux-hyperv@vger.kernel.org, "Paul E. McKenney" Subject: [PATCH 39/47] clocksource: hyper-v: Move CPUHP_AP_HYPERV_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:37 +0100 Message-ID: <20261105163045.38862-40-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-hyperv@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 timer and IRQ disablement, both of 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 93b8498e26c4..b49b67ef5ecb 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_TI_GP_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_HYPERV_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_TI_GP_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_HYPERV_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0