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 94746511E68 for ; Mon, 19 Oct 2026 13:11:01 +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=1792415462; cv=none; b=IMaAqFKb02uR+UkUJbFvuOBVSXtkXLvVA1/UT/MmXy9nqRDFPfP8WzOO+lMvVeCkmWGet66WqifAmngvhSnnpr/FA6tKpp0aF+Jp3Wv7no7T93dzVUkkjnaGrLc6ZN23utt6LIu08R91bKGQkJ7vLeB8JmTcAelJ2fX7LvHUaw8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792415462; c=relaxed/simple; bh=+OGb2CxVoE+AboXsXUFP1Qn10McT5s5Rj7M+20rfodI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=J8O+ZE4Vek1TWTtvv0J+fIQxUnP3qECPchqLc/rk5ngykT2tH87JUzskrNFBpViE0sM4uL16W71ry732iG5G6TbZa5gjXGgBXzBq6yn5pbzzGkhcmiJpzNyMkKySbwscFLvhnmreLEcXf7JE7HI1ThDCSHjdO7IluAvsl0vgLnM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZjhdnCX/; 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="ZjhdnCX/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEB421F000C4; Mon, 19 Oct 2026 13:10:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792415461; bh=e94KeCfk+tz3G0dq/mjsq4/4Xph63O/NBKRF2vRWB4c=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZjhdnCX/eHkSIo+9Fwq5vIiSdFO/iRFr6SjxMNaGNA4nzPII1X42LMSt5RkyzKoqY w3oBHtmssQK/vlbYgHti5YTQe6UwYie5rBr1xRShfhTSri87BH6pQq2p7v7j94c3aN ETKhAh7Oz64qAPjXMgG8u2KXqnR+bAvq+HRIK++I8Rt5QcmpPfu+V+SKEMub+9YhD9 c+XOz3SNIcRPu+HktzYusqBS4YcyiQ0v70C9G7fLgarrOoWe1BvejjuWDL/9NnOcNo u5jt811/zSC33cFhIWFZkmp+VQe7LoZhiPzJ5o5lC8Kta1KZXKqGvehie0cMDKOrN/ w3qTkNbwu88zg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long Subject: [RFC PATCH 42/49] ARM: xen: Move CPUHP_AP_ARM_XEN_RUNSTATE_STARTING and CPUHP_AP_ARM64_ISNDEP_STARTING post stop_machine() Date: Mon, 19 Oct 2026 15:08:49 +0200 Message-ID: <20261019130856.49711-43-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(). None of the states here have a teardown callback. Move them 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 8509c6377a61..c27e4aa109ba 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_XEN_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_ARM64_ISNDEP_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_XEN_STARTING); + WARN_ON(st->state != CPUHP_AP_ARM64_ISNDEP_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0