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=1793896366; b=wXCRb9Hj41m81bmRCsJI54ppywO5BT/6yYjR5Jlh57bwqjVwcrLxg3wiRSLXFVf4L2Qq h7c6jeayxru/Hrb8AZbmtdMuUMyzpAMEMhuF4misMQ1RM7ZgCqNQWKBFJUqAhDJK4tRhB oZ6wEEVldrXWTYnPXrWuZwiPjRGvQHRi6FvApZvPmXvtV3s1ENjum6w2DBFYfeoUyHzIJ L0odHPaRyqjp7ygEObgnQ1oivdMnMG3v91vcJpM0FzN5BXEfAyokm/IG8bq2Wg0qj7HqT 0uwgkwZqVkGkggbqaQwnkuR+tSsULZw59j4UI0TOT438w4Z+Nrxs1NwIPvMqfGiu+MA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896366; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=cpsPkAp2Rrm1pPfJbprfMW7GjVyRJR3frtLl+XFKrCQ=; b=A0QZZbYtX+WQ82Ra1IceSI9qpVqTg6ULq2x7stWkbzVtXoBhRtmlXSVGz0b3V6ExFlIy 7aUcriuL79wIy81RvavyOFGzARYm9jDFiJIEpgnNU3TANvpmrYPdL0UCI9cvlC3U37qUK bhDWELu93vTu9pX8k/hxfc0G8d/d9iMOt6WWvCY1K42Wk3CAfYcLDv+63L2HgEFENXDdu eZOgvajbtxyqBZm0I9IWncbquRN1DLPV3ZAEfN+qiHu/d7RI/0kn6IKqb5/+N6sGmknkX xoAoetPnnAqj2h7/nFU+I5lw8+nPc25UxLfx9JuWgwSq5ihEWLGGHUKNEzmITYzFDQQ== 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="l/1lLDLJ"; 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 D9D5D606CBF2 for ; Thu, 5 Nov 2026 16:32:45 +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=l/1lLDLJ Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE9311F00919; Thu, 5 Nov 2026 16:32:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896365; bh=cpsPkAp2Rrm1pPfJbprfMW7GjVyRJR3frtLl+XFKrCQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=l/1lLDLJsDWJxlXfRoD4dwwDVAWE/D6V0vlkos62vJNRKKVOJr/Cah+GZkfsgymOx 90spIYW/zkZa/48aYvKNLg2T1FCwzNIsuj8fWA6lnDEg33rmqGfHpaPsAj71IOhPr1 STcGDsF4iZKoI10Fz7YdDMn9+e9BKEKFraYaFsOxdJsBDZJaDV6fRwmbUrmFF9S0wT kHEioP1BS/8wB0rY5KsETXl5mj8L8p/8pj8Zbaownc6DOXKnZYcYrriUuA/NRrDb7c FRFC8Q7eLHAEJfCOsk2rD2nRBh4T2aGlXRzMEmx+tfXkLfChfp/81a8c9SkJvkaKlH H33PRIE91Oabg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , "Paul E. McKenney" Subject: [PATCH 36/47] clocksource: clint: Move CPUHP_AP_CLINT_TIMER_STARTING post stop_machine() Date: Thu, 5 Nov 2026 17:30:34 +0100 Message-ID: <20261105163045.38862-37-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 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 04692ae09199..01c343b4daea 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_RISCV_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_CLINT_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_RISCV_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_CLINT_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0