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=1793896378; b=rTn2JxSR/gnCNzrVF5FoKBW+QMDbmOTqfErPgdxGUJclKuq87Q+60Xg5mpJIOtW16QvW DzABuRNdIxHd6lUylztCtP+3T0ZIashszhe8OEuHanITq+jU5arYAhAYz+C59R/Wjzi0L uwmYXfSkoKOeF0K3EOi86PhYuesHBEWiHECKdQLd7GS+sfd5+H49NEWZc1d3RQ/Gu21CT kKPS1tkhM7EPz4QxWjAx15LpmcwDWVYH6qAxx8IXLS0EJPCXJfwoRZajvbFJobZCIhtp0 n6PIl49IRKoLup5G75bD0ZKIpKKca/rSlRLWwhDL4q0J99hPCLvrZVWx2kWpYUQuJtQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896378; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=daaGydOz1Y6OADJlLIPv7bWr3S2j5AgKwUzJ/93xNMQ=; b=u0CLze/MCe/OvtM8uvlnc6MrsR5c6zOHSTIilKOYdHyP9svaEKIc7K2LPfHlnjEC7jO4 2QRkTv7AJQNgTJpbuCtYaFWh00ByUpXXpNis3zjDlHuc9q/QUAl/yvbLsm3WmP4bX9O2a RqLs3KefHgkS62ZZ43uVPSD39l0QJvxoI6dPHb4M/rD8p15nAubTz7pz4YKvfExry1of2 X+eYmUWlq1ideKqO7OSB5vHyf908OEV7lIqlEvrA2O0xAqkDYlvXu6O50ZHURs/ByAora CWRwW3Bfoqux5AiMjM9Zh/hmHb7ClDURRaWlh0kDFzqtvf6s6FS5ENM719DEzvSsGqA== 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=kmR+PtDf; 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 893EF60A260F for ; Thu, 5 Nov 2026 16:32:57 +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=kmR+PtDf Received: by smtp.kernel.org (Postfix) with ESMTPSA id 471361F000C1; Thu, 5 Nov 2026 16:32:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896377; bh=daaGydOz1Y6OADJlLIPv7bWr3S2j5AgKwUzJ/93xNMQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=kmR+PtDfFfgLSvNRrok2HVM1f+DDb8qLbeq7s2HlItFlZjndAm2Wd/tlOadAJd/fv n7X/PNUYK+2cVqJgrr9i9ol3Wm9dvUaAPsGLIFn4O6/FZtdM7R0ZIDQN7NIsbHU1lU DdbkDDeRLRpks5403Ix3nSLcY2wtb4A7Org8TUTLsBVdy8yo1hCxrB88PZ9Qx/QW/x 1dXfhkAkwMC3UTmW3zSItdNyRmLTYvk6sOfJbx+UgW6sGKYGYE12QY1sfHSlaM7Qup WZE5wI2fIAK2SIfmsL75ziIcrsPwhC+z8MsJ+gAqPamTdcRNdzXpu3DRF8bi2k/EoA 6u+uaHmb86ELw== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , "Paul E. McKenney" Subject: [PATCH 40/47] clocksource/dummy_timer: Move CPUHP_AP_DUMMY_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:38 +0100 Message-ID: <20261105163045.38862-41-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 state here doesn't have a teardown callback. 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 b49b67ef5ecb..47b33c6759aa 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_HYPERV_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_DUMMY_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_HYPERV_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_DUMMY_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0