From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 580D360A380D for ; Thu, 5 Nov 2026 16:31:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=J52MEjFU; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=LlTcQXWe DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=ZqPM3lz+Qi+tuVf9TikDN4riZPh5fTUW7R1UE7fCWfI=; b=J52MEjFU0BBxyo FGxTntOBUAaAoFOrBzjRfwGT7JbBs3lehdBUo0tUAgYm+6i3DiUE5CdUva3V4PpHVeAP7Uf5Tc2Uc totqy12YDRwTOzkfwhAmMExJbquRNvDQJHLkHBoaqGKznt9m8MXIchtx1k36iTd8WKZTT7LlyLUH/ ich01Hc90WnlQYrURsTCd23OeHIAaOvoAzApX8w5BVPVuSJ1/Pm/pxCOnYn4qBCcRVm0XUMQZLCya AJV4BBGBceJXw2F1AXFedSF/xQDgYveYDGzeeFjYFaN2D+TlbR8v/ilK9foiVwjN8VCuwK6O32FEk /zUlJai/cfpM06WU5wuA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0Ms-00000009cRK-0x1C; Thu, 05 Nov 2026 16:31:14 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0Mo-00000009cPB-31Ub for linux-arm-kernel@lists.infradead.org; Thu, 05 Nov 2026 16:31:12 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 2E9D760A53; Thu, 5 Nov 2026 16:31:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 757D31F00A16; Thu, 5 Nov 2026 16:31:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896269; bh=ZqPM3lz+Qi+tuVf9TikDN4riZPh5fTUW7R1UE7fCWfI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LlTcQXWeHY4iuS02HQLwEakv0vB88LygZgP24Hpv0zjrdpuQCWW9sbVPh7RcjyQHr /zrCXlHoMwhj7zErNroZuX3/f+hEtsiPPcnWms6P+StLfbZOSFocFqK8f4eQ4yi2tU mmBNp7I1+YHLk/MK+Gi8Ele2k7TVUk1eneeABiVCkPL7/mGwq3IOmmOevTksTAFPDf sMoCh9hF1UPI62Y+iwqGKuasbVBTRZmAzYrqXuGlmNOP9OTNm3S9nCENKtrCLKiyUY Y18uUzxtV5bXQlqgIls9lsg5Hg6gLZCHLQaVAWjtiLkhoNNfPZCMXoknHqmk5ITLHp oIwy4FTthOZ0w== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , "Rafael J. Wysocki" , Christian Loehle , Daniel Lezcano , Lorenzo Pieralisi , Marco Crivellari , Peter Zijlstra , Phil Auld , Sudeep Holla , Thomas Gleixner , Ulf Hansson , Waiman Long , linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, "Paul E. McKenney" Subject: [PATCH 05/47] cpuidle: Move CPUHP_AP_CPU_PM_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:03 +0100 Message-ID: <20261105163045.38862-6-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-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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 only touches local data and also the local power device under its power lock. Therefore it should be safe to run against other CPUs. 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 58bb74f0fcb0..acc6a0e6446c 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_RCUTREE_DYING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_CPU_PM_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_RCUTREE_DYING); + WARN_ON(st->state != CPUHP_AP_CPU_PM_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0