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=1793896340; b=WCAS/V1coDiF6Jt62kknAwhfrdTh76cA46hk2RgX0DblkQ9torYpWt2o/Bp8hd8E7zZI Kgbsu6TjM+ckF7OBH1mxBSrZ38wEaKrUD/AQ6koPo1aoAxSnTTsKpNOkb9Hun8n2oYl9b 1yxU696DY6d5eRor4DuDPuh4M3VFftk20j6tUvtuHwxFaKF+8DME7nrlwyPECbSDiOTcO X86GwZwrs81uX31FUEX4ZKZZ4nFNv+YSJdfy6I5xopgF+mKAQyAFGOg1xoFZxCjVQdGMh U00R6w57/xvnjkoNCIkbjOjPs3Qy7693eM/0BUx2qrWdZxYsCjdw7ZatxUITuNA1JPQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896340; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=b460Q3cwnl04EHCg8MutI2uS9sgGHru84RfF/i2AAKA=; b=1jlp+iy+2E14TIAm2Pn7/QnbfYXY2/eNCHyIMhj6BFhQQ9KmgNq50JU0wyGZ9DBMIYHz km18Y/5j2vOYwQflPe3lc8vsd566UZNB2AyW1I+rXW/DG/Ayqd2KIGZrmNThK8YihxfLm NicvgEgu800YNp3Smxj/6953w9Kl3loI/C5YLclBX8qsEJ/AvgrE1hTuOGl/5XLHq0Ivd Rvx6l3SqHhc3r+L4bF04KQx128sSD2ulkRCvLSNAVVBsViVjGAgF78027OciqY3sfGkYv uIPQ+OQ67HC1NBP5CyEHfGqVkuv0gnokV7sBPe5FXIwrxH2xY2v4ojIRET/owgrAD6w== 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="UyZtP/2i"; 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 12A7D60A6F72 for ; Thu, 5 Nov 2026 16:32:20 +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=UyZtP/2i Received: by smtp.kernel.org (Postfix) with ESMTPSA id A41981F00919; Thu, 5 Nov 2026 16:32:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896339; bh=b460Q3cwnl04EHCg8MutI2uS9sgGHru84RfF/i2AAKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UyZtP/2if2EtBCr0hvwUtvmhrbOiwo50jhs1QAMhe0u0drleGnIFma1sgbIeTwunH +EUDfuSgPv89WmLqSRnXcN6YTFfMqVSOTmZjuJFsFEDFGyZCMOGr7B/g5T2BRtd+Qg 16yB78OWIe4qreWQQIl/F2nlPBgQ05eqBeOMAtFWqeUYPdLfqyHrC3GVCH7bGxOib/ ILLCCJ7zf819IAGUWDACxaDoDSk7lDflp7TN8OE3aeYqySGQqLnH1aIg3XY8X4QOKn BKpugwQBduNmMD8lJi/2RR8x3B6mlhc5q/pQAqXataEAYI6SaOMuxR/Rsseyy+xpKM 4s5698hNaTHIg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Marco Crivellari , Peter Zijlstra , Phil Auld , Russell King , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org, "Paul E. McKenney" Subject: [PATCH 27/47] ARM: smp_twd: Move CPUHP_AP_ARM_TWD_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:25 +0100 Message-ID: <20261105163045.38862-28-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 38d60ddc166a..d7a6dcb14885 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_JCORE_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARM_TWD_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_JCORE_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_ARM_TWD_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0