From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793896284; b=kDEJla5CI0jAmQx/IjOTRRc8bRV98a2vhEFj+FnaX/PnWndkM8RixlZn1bzioeZMvdE0 GQN1to/glV6EsvWjGJJI0wfNCPI/99eTEBDsWy2uWegKg45Ntc2BviFLcMvGKzvTrNmtX tPOAHePVRUtA72ve/ZlB44cwkNRmTgHb/Jqe3dei2hVXVQnAblr0l7Zr+2I8moFQXwIED C7BgfM1Xj31p1dWQ++tq83nuduerMfa2D3RP8zt1lH9zP5SbXcWcuM4D/iWLjEz4zGHYN LCkDGeZ56rjKvfrhnYQeqFj+k/ionDqkRqCapJvsGU0WpXSLjoJ8MAdvJbiGKdFY4QA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896284; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=ojdQO36VxpBln+lcBBfyYeZVhigXx2PzGxmPWtpJuqs=; b=ISuBwQMKgeAJcn/hXJld7dPOL3rg3ae9kzwdNEEp/RzbJYUjgYWSswMOCKu8EADZVUnL Ra/pzD8V3wIrG9NKFY5uYcahF4XmTKGHJ8kGXEvf2+zr3lVcjKRH+4mkpaCSAtULQnooY c1jh22vGrH4XAFvQMBZhmLQSamyUnbXcgk/lqnbNq/AiE3CYEZvgbD3hdqpHp/qTVw17X QW8PRHaM8hIyE+7KOsOfeUHKucS9aGrkmRcdUxDGUrNG8G7PD1wnCFLnNQqJecVyxUANQ Ao73EdsSOojkCbemVgfngEe3DZfmhuKSNeI0MnkLPUivxaa6QqwdskFteoZoNlFnqQg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=SyFM2slw; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6095260A382F for ; Thu, 5 Nov 2026 16:31:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=SyFM2slw Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F1B91F00919; Thu, 5 Nov 2026 16:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896284; bh=ojdQO36VxpBln+lcBBfyYeZVhigXx2PzGxmPWtpJuqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=SyFM2slwcNEzQxdyqKnv71uJj12gtCsSIyOOogNNwwT1c/UhRQe6GO/k6PVXzplol PvCpy6c8Rf3DbAw+A66Za8aaUbyDfTK5qjqyknbuDUETOpTDfDT1O02gxZOgvBSq8u cKWVvex8KerxG7LcILXGca2TLev7nlLjfEb9DP2Dl9h6hwexbvA++R+Kk2lS/6qiPr GkSHdgTNGKCEoeFfCjnz+OcKzaPODHU+tM/atsISP6+fJ+prbOkaG0FhOXzbzmB3E1 ZFggRmplMGIYY4sjZSvaDPKygIV/n/bwGA/YuPdjMFGnNRs9yBvb8OrqVTMwQfEsrJ 35tw2r/ari49Q== 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, "Paul E. McKenney" Subject: [PATCH 10/47] irqchip/sifive-plic: Move CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:08 +0100 Message-ID: <20261105163045.38862-11-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-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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 2200c6691ac1..c7794716bca6 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