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 52F50606D82C for ; Thu, 5 Nov 2026 16:32:00 +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=Qik45mw8; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Okt5JcID 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-Unsubscribe-Post:List-Owner; bh=TvmrDlzZtbgGL6NqhpNz03RAMpPUJAkoIcMDwLC/7v0=; b=Qik45mw86Xix+FqIji2oQ9OnPR 8veFQV6HhQZKnvRNYwJ0DjBuTtojU0myn2ILWVVieXhuIILab/4sI0VyZPcvdPpWVOOtzJOj6uuZ3 UP3PLM0sGQXFvO/iy9EgwFydDaoRaV9ADqtxduSreStYI4CuPdUtywLcgLLNjhHqI+/e7xZ/07gYG I3LL4Z7y6LU0PHpVTIvPYBiCnTcxlmlmplr38eIH2lWSTLieVSRnk50lGS2xyFS2X/1yO/bO5q2KN IUNkGjM3VX6kFmoWEa0yjm71c036RhgtBSKAgI32UHY6Wrmuhiw67zsxxFluYlg+bu6M+fhF0idwc vIkITg7Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0NP-00000009clc-15WY; Thu, 05 Nov 2026 16:31:50 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xP0N9-00000009cbu-0nq5 for linux-riscv@lists.infradead.org; Thu, 05 Nov 2026 16:31:31 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 99F44609D5; Thu, 5 Nov 2026 16:31:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DD551F00919; Thu, 5 Nov 2026 16:31:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896290; bh=tYa2kVcQJggBzf30cyG9hxA6HXv+PyuWty9AqwH1tx0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Okt5JcID6lqYQk81BhtmQVx0ZDemw/aCKTU/Bjy47LZPWA2PuE7Az4nfV/beqI8gc UkmIOr9JHshoJvgEhX55n+FNyrANHSc3fZdOC2ImWkQimI1G/m7PvbWlHbAdK/B0dM 3hdelEbjqCsynL0JJx4p6RJNuwC36D6C7xX9KJAb1Cd761+N+PAZsIAOuSrRKIS/79 yOsahGFSbEe1DZWVoc4CvjsxTHKZX/B7kplvSN3XqTyPLKmKSOBj+U/vezAqyPP80c XHVmYcxncvYWTrDsJ0sswzC4EGtNA4He1rl4nkEvY2Bs5NItB4Kas+9Oq0UtqqwTcc ggOnpG/fYnqqQ== 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, "Paul E. McKenney" Subject: [PATCH 12/47] irqchip/irq-riscv-imsic-early: Move CPUHP_AP_IRQ_RISCV_IMSIC_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:10 +0100 Message-ID: <20261105163045.38862-13-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 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" X-Spam-Status: No, score=-16.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 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 c86570b13fed..151e4d9673b9 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