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=1793896396; b=UXXQcUBshGyvB4EqHPPRCaBQPKOkHCnzA6IVGDbmPwYTPz+1dsBuUcnS5Hm+9j2DvxyY +Sq+TTi9qhhFCJh09w1WngxJrxp75nkRGMkgHjhQJ+vkqSwCoZH9Bwig9rgqv8jetJHDA PpSslONBKt5HmNzYkzx3zsRj4H3xoMwP4H/uxk3czIr15sgCuOUIhcfBQllsXruqa8ua9 oxVENpgIXN22BNmHLKO0UvM2Hz+xOaXdQ/B5xL0vx22otZV29ydBeLpg6W+4lxa5ICpmh hnVtdcR+K+kyPtRbp4FJZpS2Xv0is4lyjVvsUZgsWE9xkaDGa9v4z3/HARYLl9SBwIQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896396; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=qE1tq1rr4cEJpbwdtqUsfVIbjxrmUGUzpJ4okWtgjys=; b=YnZriHbTcWhNVvdL0UkiAjfs+xJs1g0O5yd+GhHpc6hhJo/mUhr0cVNVqU1+tFDKdrCJ tvW8N2JrGOo4TbnzpA8KlBncf9/r7/miND9M71TjOoYnoQyONJ5JYjkytR8CuGDtbBTyh z8iPOF6Y14gyyt0SukzjRFGwWGgrk3X3xCrQLnmh/6YfKtTmKHqOlbezVE6fIIjZYPSah yDk9o83uqOq+NvL7xE1vd/ASoBxvkMkpoO5wL+Bx+1jFooCRS9G9Q49dEOoVd9F1CzRtY cVdH/2o1rKlXjYkm8YwqMLhHoCsTwhrF/jE1uNmWt7vrthCkeZZGqUq1Jzo875VplFg== 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=mlAnTUHC; 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 922A9606F93E for ; Thu, 5 Nov 2026 16:33:16 +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=mlAnTUHC Received: by smtp.kernel.org (Postfix) with ESMTPSA id E120E1F000C1; Thu, 5 Nov 2026 16:33:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896396; bh=qE1tq1rr4cEJpbwdtqUsfVIbjxrmUGUzpJ4okWtgjys=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mlAnTUHC6GJYDGMliPGljXkCD9ZKMtZePBL3it1C+V7h24jrGjNfZ+q9k4OhE+xBE 0YcxgiYEDXXoIYqFGm+SNuiJ47x20TvhfkK3az6+7w7MdV1Kz0cLIOUlfh1wPL5haN Rc+vUSxwJjrLuaKC3GPiVOunqT0+4LB2vezk+hBOr7YgotQasQW003edDJsxWeTvo+ tMpQbKmyn+LTxVPRYvt4Dz1kZc9JDrhThtDrK6fht6yn8gR41SSzv7BejXWbteVCuV FwCzwfnCcDtRnz6Hsn17ZTWUrmc8wkF5oalI49lZgPQPodr49szTu1ZU58l8+JzM7o qwtgGAO4+82GQ== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Broadcom internal kernel review list , Florian Fainelli , Marco Crivellari , Peter Zijlstra , Phil Auld , Russell King , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org, "Paul E. McKenney" Subject: [PATCH 47/47] ARM: mm: Move CPUHP_AP_ARM_CACHE_B15_RAC_DYING post stop_machine() Date: Thu, 5 Nov 2026 17:30:45 +0100 Message-ID: <20261105163045.38862-48-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 cache readahead can be globally disabled while the other CPUs are running. Move this teardown callback 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 995b235da733..b6d7a8e70fe5 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_X86_TBOOT_DYING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ONLINE); 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_X86_TBOOT_DYING); + WARN_ON(st->state != CPUHP_AP_ONLINE); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0