From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80E8D4F85C3 for ; Mon, 19 Oct 2026 13:09:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415374; cv=none; b=R6cJ/tnGqxcSIq4bNhEckmGcGmFcZS0wM6Z5ZuMyWTy4Q3X+VNTdA3XTjodyqzQMKqFHdoNH5PhEzZBWtZvfaki86Z7ZEI8T/0QeiOA1ExdUEyHaPSk+Mm+rUZVOIv9FBPmyW9N34i9er2awtq7sR2RZsP/p0a5HMn16Kk2mAIk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415374; c=relaxed/simple; bh=8itq7aOhGhsRTq4/qPOUQcU8j0L1r0aMJDMGZJEqMw4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Uw0Io2ZvHV1fMhXMhOIilYjjKeKSxFyAz2qV3MC7j0VNiv1qtQ5vQY/0tJhCu7gtseHCvTGLCRrsRFtNDuUUB6qd0RwTTggEPDer319Eu+BTiL6X0gVzF2fNY6nVyVgle3mFC52rq1iUxIjS08l9HkTDCzTWDUsQUcY9WpzvwW8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ezjbMz2u; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ezjbMz2u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C30841F000C4; Mon, 19 Oct 2026 13:09:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415373; bh=YgeuaqRtp5CK1SLmK81XKrsJHhQCxQdrEiseHucAYLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ezjbMz2uVDoG9WVlXEnf3OTSz5PFTTX/ucD/14duckHlDn5mtVv2Cxm5kQtDRDgue cofZxcfSR/CHqq8JZnhxgPnPhjqLcERiEVmvIFaaP0Ae2Y8uVyXCkv3qoLOTm6q+qO F1fvDCyjIrzo8Czkt1zjSy9k/V5HUI6MlLO6mEQYPqKxB0sbQpheRxzDC+zk1haqth N0zNvQiXBy+4YIEcCG1byKAu91XSJzE8Seo0aivOmDMbtuwrk1wI4Qhg+ATGP/7/dB m3z190i75KJ4iI3b+l1iwE+EFcb59NjH1eT5QvmE7IEbRbrKtja5brLARWSSouFjfJ EddHMIHT79m8w== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Marco Crivellari , Paul Walmsley , Peter Zijlstra , Phil Auld , Radu Rendec , Samuel Holland , Thomas Gleixner , Waiman Long , linux-riscv@lists.infradead.org Subject: [RFC PATCH 10/49] irqchip/sifive-plic: Move CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:17 +0200 Message-ID: <20261019130856.49711-11-frederic@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261019130856.49711-1-frederic@kernel.org> References: <20261019130856.49711-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 callback here simply disables a per-cpu IRQ, which internally locks the irq desc. Therefore it 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 f32404821731..661648ada894 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_IRQ_AVECINTC_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_IRQ_SIFIVE_PLIC_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_IRQ_AVECINTC_STARTING); + WARN_ON(st->state != CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0