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 04A6E606D700 for ; Thu, 5 Nov 2026 16:32:48 +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=3gffPHj1; 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 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=b460Q3cwnl04EHCg8MutI2uS9sgGHru84RfF/i2AAKA=; b=3gffPHj16TruDs W2K2rAsVF8s5XjetN/XI+oeqUb7C+NKAapbashGuiCaa8uW2f956VC93iV2sWxBhq6+NZrt3gBnj+ 6uUyEee/ExfCSumfRnyWKranTzBVL46t2W7mnZpbW0GErBbTO/8m3lqvvu197My0ReGArwFvLRspc jjQinYXwek+heQq8wShJleKcvlPoqM3HzAvxTVXCsYUa97yLF+ekwPXXINVE3mvP1ezs4UWjQFxWi ntlAnEgoD66msrXBqK+2kNC2gXngI7o0GXt6dlsOa2yLGLngP7Htvbx7zIvKkOT1ZM/khwAmhomNz Mcii7lUmZTV2jPDYOSQA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0OE-00000009dRy-39K5; Thu, 05 Nov 2026 16:32:38 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0Nw-00000009d8c-3NS9 for linux-arm-kernel@lists.infradead.org; Thu, 05 Nov 2026 16:32:23 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 376D4609FE; Thu, 5 Nov 2026 16:32:20 +0000 (UTC) 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-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 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