From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F2B1ECCF2DE for ; Mon, 19 Oct 2026 13:09:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=voBie8TX+YrV1ZJDe4DaQOlWAGClJCcX6lGQmVVmtRY=; b=PD5jKuMc7rK3Yd zte1uRLHkB2/J8wqdudlc0f2KCxgMl7lgEe/STgTxADNeqCCCq74zTX8XcWDQqJQD3gSZNt2i8wV1 LnT6qX/AUNSq0nrH+b/5jDQSox6lW1oziowVoUGZWgyvYULF7m/14VAXSAZgcgNHI1s/kuwY946dD iFWTr7CpY5bcWOgLWKSwcZxlEUwdKpeNLrJSgK+I1VNDDK+hMEF5eqIqhBHd3KRYm0MeTuLhsI51e tCOSCL4LB0ixsXet4Nimo9/hB3RkGB/TXn50HnoWZV3UrLfDD4HxZSJZ+Y3OOJmpsTnalIGU0zTLl nYZjQbwCuh8ag0yk9ryw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xIn7V-00000007SwZ-0EJU; Mon, 19 Oct 2026 13:09:41 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xIn7T-00000007Svt-1n0x for linux-riscv@lists.infradead.org; Mon, 19 Oct 2026 13:09:39 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id D9D8C41FC9; Mon, 19 Oct 2026 13:09:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA1A81F000C4; Mon, 19 Oct 2026 13:09:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415378; bh=2ltEc+eZxkTom69hLae+Xdkd8PkspZJkmoyFqTkrd20=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Q2v+7cGpgqUftBDwzL+ctAj9tyHalWz8s0rPAYsKAAmNIt9/0O6hqTIsGFlPGT8ne tuMRGBpoRkawpYukoe+pvwUrSR9cex9qVMwTW8+447169dalWHlKg2zMyiGof4c/pG 17GdUEg5BoSLcNBE0NMfUpANAj2J2YyVDim1JAqYnBGbtLmtmSdltn5c2aO9xFg6HN IFta0P5b6vmaCzKSo9SGkgyxUqrfwrHOApDxbC7vKwHgsIbABVc04ENcrXyqraSQ/B MEONpo0ucfT44H8bLg+jRmb/BngOlxuRBa518Fya+SkIQ2AruYrM0ORSFgphlJcKJ5 fOjfgO+V9n3XA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Albert Ou , Alexandre Ghiti , Anup Patel , Marco Crivellari , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , Phil Auld , Radu Rendec , Thomas Gleixner , Waiman Long , linux-riscv@lists.infradead.org Subject: [RFC PATCH 12/49] irqchip/irq-riscv-imsic-early: Move CPUHP_AP_IRQ_RISCV_IMSIC_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:19 +0200 Message-ID: <20261019130856.49711-13-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> MIME-Version: 1.0 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 disables the current CPU IPI, which nobody should touch concurrently since it is seen offline by other CPUs. The sync protects internal datas with &lpriv->lock and the IRQ matrix offline is protected by &imsic->matrix_lock. Therfore it can run concurrently with other CPUs. Move this teardown callback 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 6acf07afbaf5..ce4e2ece371f 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_ACLINT_SSWI_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_IRQ_RISCV_IMSIC_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_ACLINT_SSWI_STARTING); + WARN_ON(st->state != CPUHP_AP_IRQ_RISCV_IMSIC_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv