From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CCBEA4FDE59 for ; Mon, 19 Oct 2026 13:10:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415421; cv=none; b=houJiGY2jMB1eYAv2fVEb42Td21vVrmqTSokHFNySzSxTKCqx4ue+2qweBLe61ish38cdmetdvRgG5mdePw//gcrlfW+9vEkDrbOyYdJs27ENYVLoYOZ2tVUPNIvUfmYGzX3JLQqS/GOdOAIvfOkgYtQgGJZ/FwKRyd3i0H1GtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415421; c=relaxed/simple; bh=X6auEPM6Ev3rVCfKF+249AZ0OWslybPIyWntVmrkPbE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=c/cmrcd7y6zQGLqCurfe+rKYx0v9MT8UQ/12NqRwqxzUG5rti7pxg6oV3GSNpptdrqgVv0W90DYDMc7YWkIHlga+4h5+wCQ+zzobLqxe3pZxZrQn17NXtLjGrboPcVNm/IqBoDX7Np2WpFZC6dJmQHAp1ZS1pC0doiurp5l+mWg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bDTcYUlW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bDTcYUlW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE0531F000C4; Mon, 19 Oct 2026 13:10:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415420; bh=LQ414WyaK4YDWIYj77LPqz/+pjWEbp+HwP5P+Y3DZAg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bDTcYUlWDG5cw9DIAMS5pqJEJK9H/EtWtM1o+j4kEZpOvUkB4TOMOnEgyNTYcBKp9 r2JgFjgFfZX83Tr1bv8COq2o1CQDO+BlxseG3sBDX3n9XBp2aPRhu8V2n3GMWB35dl p7fnWHdhjOK/Ot45jgMIhwVJoVBaPpvH7Y/9Howmya6YmBXG7PCA99So8PF9noHHrR zirRLtJsxpN+KoW1PQjy91gI6nOHyeUil/AOSzfggytGaKYfFVUFiLI63aEW1MyiWz tBu81uCgbLWLY4zYDIGQ3ztuP7KDC+/Xet8gXsh4xolQikoNwLRQpBs2NlNo/w70Tz gGYb6b0CWnuqA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Daniel Lezcano , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long Subject: [RFC PATCH 26/49] clocksource/drivers/jcore: Move CPUHP_AP_JCORE_TIMER_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:33 +0200 Message-ID: <20261019130856.49711-27-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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 7bc94829b68c..1b3942012f2d 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_ARM_GLOBAL_TIMER_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_JCORE_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_ARM_GLOBAL_TIMER_STARTING); + WARN_ON(st->state != CPUHP_AP_JCORE_TIMER_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0