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 1FD4C4F6466; Mon, 19 Oct 2026 13:09:54 +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=1792415395; cv=none; b=KMEI2ycGqI/YPfv1iL7wdJpjk6PPWdA3x/Nve45N1SgCc1W4kdAgO/qLsGW5G0ysgCMAdK8EmGKRqSZuB+mffscsxxaTCRF3SY+NzYghP3BFS2lb95Nd2HfTs7YjR2r/J5ybAJ2iVx/VwNIk8yDcWQj9LSINgPO3xmJnBsZoNYM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415395; c=relaxed/simple; bh=xhbcid4awYtIfo2lynkIvt5nmZU+jAMrW0hLor/9geY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u/wzfPW9Akkg/I2E+A/+Hd0L1RLSlym36Xuz5jRU5rlqumESSQolcKXWKePc9ZlldgRUkAFxC2Y/dbYrz0IshXjsir449Zp1BFF3xdJVkHYPRLQZmT/qAzHU5Hrg8h4jxmQL7ino6HnZXh+MprWjaTwyY0a4oT+1FaZimTlqHKY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=F2qG8hV2; 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="F2qG8hV2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 67B7C1F000C4; Mon, 19 Oct 2026 13:09:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415394; bh=6hXQl+zNVR3lDmBRZdgLpcRixFxhz+tO2HHJJfE9T20=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=F2qG8hV2QqD42d3XalcdrpqtnVhMxBRjbkj6arkz50CBz7nBtuS3mznGWS4T9SaRu r2PTF4YC8g1NxoSFt9mdM0MGzAk1pR/9cesd6oZGFNOybrn1dVIq1bKXPSv3YJ9z2D SbqB125baSuLU+QtgaRfzoo4Zn0YWhIj1Duwnu3Ru41fPUsiP9S3/FdDTLm7tuA6KD V0F4wH4WuU47s8OuXP5s1Ylr05l6ILIXs7Q7l+psSoZx3qBBEG2/o/HPcbcWAdasil 8QXoNTmC46dohAUI2pv57Oqwivc3WuECMT70SsZtLewKn7WFLBIlxgjAqoHKhpAydR rIJRFCHpzK1wA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Chris Zankel , Ian Rogers , Ingo Molnar , James Clark , Jiri Olsa , Marco Crivellari , Mark Rutland , Max Filippov , Namhyung Kim , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , linux-perf-users@vger.kernel.org Subject: [RFC PATCH 16/49] cpu: Move CPUHP_AP_PERF_XTENSA_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:23 +0200 Message-ID: <20261019130856.49711-17-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-perf-users@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(). This state doesn't have a teardown callback. 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 5a46372a8501..c20a822df803 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_PERF_X86_AMD_IBS_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_PERF_XTENSA_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_PERF_X86_AMD_IBS_STARTING); + WARN_ON(st->state != CPUHP_AP_PERF_XTENSA_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0