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=1793896293; b=jTycFc1zSNqaeF+MFv9OZm0GHmoVAjxuzHdh5ZQWZ6OJ4qsY3UIJxF3t4JB2oV+kb9jK GOsN0VqbTP02xIdGK8ilBK+MRdjJp4a9NQBeQBOZoN/TFp9ELqVznVjD0sdg1YXa5Z5Wk ZkNDgAEq5VHravqD1Ma+KSffPFz1lmJV7wyGeLeqyFdr9q89fzfjfieiubQDQJcRq7eW3 Hm0BkqMqavcXiEOjurY0UeKCk4hLgDJ/i54xkxDVU11HQ+iW487Qsyo0US8KzdbJFcox0 60G8I/doXWEMHyMW7hgqOGKjdBD6+tZypOAsRXLigXEHsKXIRKIFx87ORmdXTVBB+iQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793896293; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=lydoqlofgTHvkbsz7ptq5J6gaNLPKqR9QGrM3BqHVhk=; b=pBocuCMPrDzT1YTLKpudsVVPguULIyHj3FRdXA40vAZTq2HXhupcVEddnSqj5sizfdon K2tL+5k2fSQkEZsZMBuztFrDZK7kXjuFXAgypEUljp8CCP1qmw4ZrImo/16UuVR82tcsX FcTQ30Ts8oLol3X7Jg5dCzpNnygn0q102pFVYd4d7U0KQYFnbIuBJ/7Bi3kGS+5/Fceg3 +S/IF+SfC1qIrgQcE+o+YdEZqh4yehQJ34CyoaePWHMJRqku6YVKJkS1jkr5rTkCp47vg E+qIsRJf5JhfTyE4mcWDhZXXJkwwa0KjcHD8VF3HnjSmBA5kmpT5fmZpuLJW61PHlDw== 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="AIp/Ao2o"; 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 D72A160A5BCF for ; Thu, 5 Nov 2026 16:31:32 +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=AIp/Ao2o Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA7591F00A16; Thu, 5 Nov 2026 16:31:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793896292; bh=lydoqlofgTHvkbsz7ptq5J6gaNLPKqR9QGrM3BqHVhk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AIp/Ao2oco4sNyUs2JwHeussjN7xsaj7e5ueDDNMqXbWhraSHFcNTPjZY4Pu0ZdsS kJnkxge7q2rghiSc1U9HF6Aer2iEMFJsmWSwKoQGMtDyqaW47JMxTYC0Fzj/uQ9cQm KYEPu/Ae42ocL5bxM6JbEu5XyAp0bULyRs82aSmjyj03zPDwenbgUXpOvcB/0oSpJZ 5nqHSLLV9u442Ycu6JNLi7/Fk4J7WIJMAYpX1sluhhcZhLrxrj4LqF3KTyPIIr1UGl uJ9GfL6LOu9nSV6HCLfVEQDYJQdR1cwgVVTpNCoNWgizaMqOpmMq9XdP5R4vcv913R u/NVCguMF6SaQ== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Marco Crivellari , Peter Zijlstra , Phil Auld , Thomas Gleixner , Waiman Long , "Paul E. McKenney" Subject: [PATCH 13/47] cpu: Move [CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING..CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING] range post stop_machine() Date: Thu, 5 Nov 2026 17:30:11 +0100 Message-ID: <20261105163045.38862-14-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(). None of the states here have 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 151e4d9673b9..2dd34a38f878 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_IRQ_RISCV_IMSIC_STARTING); + enum cpuhp_state target = max((int)st->target, CPUHP_AP_PERF_X86_AMD_UNCORE_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_IRQ_RISCV_IMSIC_STARTING); + WARN_ON(st->state != CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING); /* * Invoke the former CPU_DYING callbacks. DYING must not fail! */ -- 2.53.0