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=1793896337; b=rK/V2q5RwtksbP6N9Ohf9E+9DQ7W3509AaruXqRPlo+bQ7qxq1LeVbLNR9qtUEopsEmO vcZKv82ET1+GHsWp1/ytI34+fOO46EZWOpFdoFJwKP6eZCRSD/mRGnrp1T+Ojb1Kshb4W t6E4MolTPLhyXwn8wEg7J1ZOTIBVEJuUwq8SYk1IbB9Al2t8pAakBttai/L/9SKLD0OF0 RqNVglxIerOnr/lHI8fKNyEoQa4R+Mh+G9ep7u8qKypQY1Go2pg60cKFVGPZVxoDTKJsY gCyB31g9XeF1Yta2noLbGBAaT/HWNg5STtoob0x1xs9tnNbooy/MbLu9qWX7R42L4FA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896337; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=5+0F9/CJdtQc1vBt9OG1lnodhgpXqybDi34JHRqcAdc=; b=V8fCLFCwIe5cMppuwlMcu7sPRFoOGCYSDy+UK7avu/9wA5rqlUgJkyS3uVWW7q/VFppI wl2GLO70W/vJLUNtHFbJi4buzEG8+H6x3ehdIvt3MzZdtwEKP5iRGcal9g84TxoRC5l8r U3t485SLPqdRq3xenz9HKlYrhQwpHfQwCMk352XOxjiI8my6pC8gRduqHb2nE1rd5Ckn7 c58TAgBC2VtJmvg4jyjyMfLsDS+5USfPU5h8r+KIiC7zloQIaX7Yc/ZoV1o1MMH+7d48z BqNKtiCDRjphl4edDOaEjS5UdXPPtoZ1vgepR95AmSr1ezBPUoZUhTCH32Wg4pqxb9Q== 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=bn2UMefy; 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 4C09D606D83C for ; Thu, 5 Nov 2026 16:32:17 +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=bn2UMefy Received: by smtp.kernel.org (Postfix) with ESMTPSA id 499801F000C1; Thu, 5 Nov 2026 16:32:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896337; bh=5+0F9/CJdtQc1vBt9OG1lnodhgpXqybDi34JHRqcAdc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bn2UMefyGXJAfCM3aSqcpR45mNzvYdqEtuAdtqsUSYgfRZii3r/TNJYmmtth4+v3S HZ2rdwMfQhNzTQi+S6/1yZViPHkqMkQS2+MtUH1cZaldaI8DKthIDxVsgwt5WMG+XR AnQYc6OsloY8RUagz/W2m291xq6YOhDBHaU0Kd5fciGjGuB9WujVJJDzaBUxd7bZa5 r23dNw1UFmEpmcEjdc5+CiMYZWrMz1Nc2OwWN26fslJgp2mXC9O74QGkl+HTNofzDe caMLlqFlYUQA/J/YubG8sujcdKu3nPjHIdmUve/H1FToBitx88tMiywvtAYwQ2ghpd lKVaMBQ2wd6xg== 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 26/47] clocksource/drivers/jcore: Move CPUHP_AP_JCORE_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:24 +0100 Message-ID: <20261105163045.38862-27-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 d980d11abf27..38d60ddc166a 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_GLOBAL_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_JCORE_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_GLOBAL_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_JCORE_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0