From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 47B714F68A4; Mon, 19 Oct 2026 13:10:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415426; cv=none; b=b9yJfsv8R1WnM9hsK/PEfMusJGpXqT/zW3NtaVh5TWUNk4A65H7toVY6Av//3TTafuSxgipFcL8XN9kgWYC4ng65E+fPMKYp2IR2nbJz23AmPUzC+kI5FPvTN1753R/FWzxuSEi7jqL4E6ZTQgIahkoF9j9WzGGcbeLdi9U7bOs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415426; c=relaxed/simple; bh=6wjPecFOYgbfniQRz9KJ0Qq/PrKRtzqKxanlTh49Nxw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=c/iTzy8bANnfS04iGbfblEt1VAHXt+74bhvhnia/flKLyI/d6ip91ODLmZuhFucVYBNKC+LWLVe1ydJGKCdViHBVtA0pVT4bved8d6d1Vz+YEeZ0NFuanHxZUTsdhw+JHqGt/s4ufG+9bL80et4PqP/sr4jNp8RHykRwWiZttdg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Wc/7iJYr; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Wc/7iJYr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66B921F000C4; Mon, 19 Oct 2026 13:10:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415425; bh=bknp2wfAkS2dNeolascWv95/7LUnc3K7PUmC5V2GAoM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Wc/7iJYrGG72BcnCJdIMDOU/NOvvFp7cYg12KDvfReURrWLvG8Bdm+pftywwvGogU Fd+RmR6l9tuKF0Ahy+InjzUywHL1CGLIEsmcvF+qS8ivxVD2fdnthYQ6v1lPJZREuJ Khqg/6WZVascXlShUpUcVJ0aNwxuQSxBR8SJ1681gv4kmZkYX+LUH66KrgGCZJgewf GBle/GCODv9BiXBYG78NNHe4OcyHR1My4s0Z36wsTeeLqepRfrqfgh1ybIMwRE1NxU t3x12jyNB9fa76K+ZpDXF/QH2VIhmVOB+jAMHIzCzDH+UJVUbDX/Tut6SiwfL340qt 9Eqz20KB74ZTQ== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , linux-arm-msm@vger.kernel.org Subject: [RFC PATCH 28/49] clocksource/drivers/qcom: Move CPUHP_AP_QCOM_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:35 +0200 Message-ID: <20261019130856.49711-29-frederic@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261019130856.49711-1-frederic@kernel.org> References: <20261019130856.49711-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 1a98d05c7f55..ba90e385d31f 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_TWD_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_QCOM_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_TWD_STARTING); + WARN_ON(st->state != CPUHP_AP_QCOM_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0