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 56AFB606BF36 for ; Thu, 5 Nov 2026 16:32:37 +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=47k+4zyu; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=BUxR6E4v 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=x9LP6CXivlT650CDHPY2LNyMQwhkNHnjZr4UOIbAV+Y=; b=47k+4zyuySCQD3 dLu8xT7gom+IRAZgrJsSGGbHhDnZf5S8HiQteTH2aiDgFDyEDvdlzMru/pY7zLXe9FWY06PLgkkzY 6toEyC5Cyjx5PJ4qdoqKbqbHrTmrDFCS+GMNVAkYtzwUkTgOGWo2K7/wS2QrvLw4ZtBTRv/HD0ZNl yOStCc/cCMYW3IBGZimLrvgwWzdFFQ0Ybz1zxEn1e4PY1kzSVh5JXotSBTe77nVS4tSRYYKwjX+Ox nsU0rifz+F8btqOp2gECYjkjnYXypnIU1T14zZDgcMcLSGSmBZIE/v11cgW9nSKKJqAathhSuWfW0 vgkG6IhplPrcjBhce8PA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0O4-00000009dH6-0qT5; Thu, 05 Nov 2026 16:32:28 +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 1xP0Nr-00000009d5O-3fwD for linux-arm-kernel@lists.infradead.org; Thu, 05 Nov 2026 16:32:18 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 299A3609FF; Thu, 5 Nov 2026 16:32:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 830281F00A02; Thu, 5 Nov 2026 16:32:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896334; bh=x9LP6CXivlT650CDHPY2LNyMQwhkNHnjZr4UOIbAV+Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BUxR6E4vRBW3eyixM5PsFYHh4FFjOkAAnNJSfvyEKvilcdL21r0IBYDrzS4JHHpmA OLxI7wmY0YztOB6kMK0fiojVtGzbcBeKPZdV0AjUo+265Xt0gEKsyAFnr1ZzGuIFPF QUigmCyDd9Py6lHXbrGHaJdGNx3Gr4Z3zEyCGXeMcyEDRSv+mMcMwUatVn5Z/sLvEj Vg3jH/53ZS7xf7O91QTNlOM98SmNTGiQ0peKWKcUJstesJ1LuyJ7MlDNzRbHD572MI RkWOV8GoEP9USzQofJ1OPbOIGYKvgkf/0W6MUl0Ylb7YEhho7N7uwdWzkbphzl2R6U 6yZU7m9Qkqfgg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Patrice Chotard , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , linux-arm-kernel@lists.infradead.org, "Paul E. McKenney" Subject: [PATCH 25/47] clocksource/drivers/arm_global_timer: Move CPUHP_AP_ARM_GLOBAL_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:23 +0100 Message-ID: <20261105163045.38862-26-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 6f4c609163e5..d980d11abf27 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_ARCH_TIMER_EVTSTRM_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARM_GLOBAL_TIMER_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_ARCH_TIMER_EVTSTRM_STARTING); + WARN_ON(st->state != CPUHP_AP_ARM_GLOBAL_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0