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 EEF97CCF2DE for ; Mon, 19 Oct 2026 13:10:40 +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=tKUgSZIZ8Rg9AMMwzcmCL5dYf5I7UnVjhLJa5juKCCc=; b=FmWn4FDzuQXUv/ dbSVfQMnzFfhx8nsGvUP+9ixoUUaewbZXxK/0JWZ0h3zOkhKeYdYzdJDb1MpbVWbxbYDS0i79h/cW Ctr6y7cbWN2+hQRKKrHi96OTgsUujezepnwYbW8XCFk/gBc0oXJ34Lt+0grCiVhMT37LkgKpI6IOs pNG9VekwWAjae3EIhjj2EQsLEQrQ84x1RkHhdPVtawcrCTVq2r75aUBBLOMPhiEWIytOwLuJRxvGa UYBOYbt8WJDvUXpmxnKRqz4jzg+5x6Jc1wBH/U262t/JM3Ss744mh6w7tQ7T32j31g/Tiw5OtheE1 xzNohzQnEYXb0UuC/zFg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xIn8S-00000007Tbn-2OT5; Mon, 19 Oct 2026 13:10:40 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xIn8Q-00000007TZK-3VDT for linux-snps-arc@lists.infradead.org; Mon, 19 Oct 2026 13:10:39 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 96CFA40EFF; Mon, 19 Oct 2026 13:10:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 429C31F000C5; Mon, 19 Oct 2026 13:10:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415438; bh=vushEdhWRPUWLc74YEYtHFujgyQzRnNdW4KguK0R+2Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Kt/sI9Tb67Dw/vkigmU/TMkei4jpYI0kqUNCilROCjm1OZDJVyo6AGkB2VPcfpFXw mx8t07U1IEShXLuvkt9IHpO5vAvofXngJcgWEClnoeHG8xDtrCsQ+bWO3DKCemCMvQ PpulC/n1w/j0kPahwvOF8x2fgkop7opRwGMIUOiDm0pp0XbcX2BhCwM39aaFfRaKyO 9rGE+XoVfHJTugREZIJgNg0ymRIyrEsgGlZ13Oled/w2B3H/1GUBJysRAzWl7IAheq O6gq+ClXDTa37VqUzdCnKMy9wYZuhPOq7VL7Gq5iOwx6E12WsHJU/17PXyIoEm+o5K ebVL6Vmf9+kJA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Vineet Gupta , Waiman Long , linux-snps-arc@lists.infradead.org Subject: [RFC PATCH 33/49] clocksource/drivers/arc_timer: Move CPUHP_AP_ARC_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:40 +0200 Message-ID: <20261019130856.49711-34-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-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=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 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 e648df00c6c1..75f4cae8971e 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_MIPS_GIC_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARC_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_MIPS_GIC_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_ARC_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc