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 0CC7E4FB9C8 for ; Mon, 19 Oct 2026 13:09:58 +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=1792415400; cv=none; b=mJO5Dz7grPpPo0ijqN+DiJHiuy2598mrSFf8OAJw1x+D/V0DsSdWUnNYDDy0rlZ4+LJTR2vMCuqS2Sb139E7Fegon9KRhAdOlkklDhC1C/Xavx5wvRHZQlKMaM9S4OpS6puG2RvlpyqMbh9styARck9nuqRnsJMgRRcjPQVqZVo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415400; c=relaxed/simple; bh=NGvtKHhXMdz2484lXHMzA9flYAwb5tjYBJqjVgpkkcs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Dfi7FvEP3WELY0PsxRkkR8va3P4BlqdrbqwJJ3uoVKf9SwpYJUTmp9SGnjwaVgtUXbj3x3OM1T4tRyhVPKzPM2mL0T9TMseePYkIe8D+zvElnQSaDE8bmaUQ7Ie6PpyU5J6iccn7Sj4jKmTYtgffK5dt3y1Fm7dHVAUmixGr6Qo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=im7vxNUw; 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="im7vxNUw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E84441F000C4; Mon, 19 Oct 2026 13:09:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415398; bh=80019jhaFL1VnCBkI7efAX76oZGfNZ9/rOF9sP+sXx8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=im7vxNUwDKjSIDnMUKzgPeXGD0zJAS4/vCyaDQb6dBi+5sRYxYqG1VMC5j7TecGPE uWTDlPMZHuLyNlaY7istJNPrPW2OyfyXY8hTN4l2/zdSGRYvVJNo3N9BCq9GAcTKNN v2clJUoyuSH9jIBUbxVnzcJUPJXAxzIKml06C1+HIkSS7qryapWAROUz8OXJq3uaIk noevpmbl5xFnOs9dbKvlImEdOTmWqmEEeKzrpIKtMulgzUqfcAn1DE90Jy3yGaf4Ii Jgyy+tnJ5au5oFo+Oa78MxEstU9/r2gY4tlOR9IjKHH1HJ9RKscYxrCOn2KY6x6WKl kz2lEkjIap+yw== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long Subject: [RFC PATCH 18/49] cpu: Move [CPUHP_AP_PERF_ARM_ACPI_STARTING..CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING] range post stop_machine() Date: Mon, 19 Oct 2026 15:08:25 +0200 Message-ID: <20261019130856.49711-19-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(). None of the states here have a teardown callback. Move them 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 b7f5d0683ff7..7d7e2d1eda9b 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_VFP_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_PERF_ARM_ACPI_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_VFP_STARTING); + WARN_ON(st->state != CPUHP_AP_PERF_ARM_ACPI_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0