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 31C1B606D807 for ; Thu, 5 Nov 2026 16:33:44 +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=U42y+eUx; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=m4bPPOtp 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=mSfS/VpYRDfWYW/SpRNCqzvpn0MjIMyjO/C7eGCEl2w=; b=U42y+eUxzOy7ma 8v64smglvMt9XzmFVmwHUCOIRWBfQfY6+fo7u4rHYhOPhzhHQe8+AJm9oV/mMOAZUecRgG4Lysd39 u6LxZaI31HZuvcJpv4oyt7+kWLyOusuxiHpYqL2Y8I1v57rUvR4uoLc+uPth+hIRzJKRSRB+yteXq CdqwSS6gJX1YRcVoudlq6sWSH2ipxQ7DQsepXve+AwTSZLuYwIQN11BwnO0Dpe3BxOxM64nv8ObD1 WsPv91AYSfCgQvKBCwUMRGiNl2PgxQHe4nZjqs/vd1nw7vwhIuuMgFfbxnPvBXbmud3UquwV5mLMY jM6mUwLY2nmHeLKIleug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0P4-00000009e1W-2Rh8; Thu, 05 Nov 2026 16:33:35 +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 1xP0Ob-00000009dmq-2I43 for linux-arm-kernel@lists.infradead.org; Thu, 05 Nov 2026 16:33:01 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id EE30660A4A; Thu, 5 Nov 2026 16:33:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD9A91F0093A; Thu, 5 Nov 2026 16:32:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896380; bh=mSfS/VpYRDfWYW/SpRNCqzvpn0MjIMyjO/C7eGCEl2w=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=m4bPPOtp2zJAdqidlzL44ZUwcSIC9juhPx3x3FhmCg1hPbcRpBDRyG8EA8ChBVcWO GsoSUrxFillZ7jeC7oF7W0RfXNllBtB1MuSHw2SlQYI0Kvf8W0dJ0zEha/+Drqoxtg fhJdvj4anabtrYu5rm41hco7crYH/n+TmP3kadAh2tfiXndhPdfUvN2nhgC6rtzX3M RFIkJzGhqHYnbo1SPdM4e6XhZQvqy2BjX9U0MYLPx6HAJlS336XfAETo65ACSFDd3G d659qkBkuWREd8f+R6qc9yEhJBthbgi5iTc/LbPFu0A8GKMqXFY/Az9ETzL+OkcWoq 9K/2w5/xv0l1Q== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Marco Crivellari , Peter Zijlstra , Phil Auld , Russell King , Stefano Stabellini , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, "Paul E. McKenney" Subject: [PATCH 41/47] ARM: xen: Move CPUHP_AP_ARM_XEN_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:39 +0100 Message-ID: <20261105163045.38862-42-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=unavailable 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 47b33c6759aa..5c84a39f6f06 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_DUMMY_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARM_XEN_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_DUMMY_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_ARM_XEN_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0