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(unknown [172.25.130.133]) by node4.com.cn (NSMail) with ESMTPA id 7858416004283; Fri, 18 Jul 2025 02:03:33 +0000 (UTC) From: Jiayi Li To: rafael@kernel.org, lenb@kernel.org Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, jiayi_dec@163.com, Jiayi Li Subject: [PATCH] ACPI: Fix initial QoS constraint application order in PPC initialization Date: Fri, 18 Jul 2025 10:03:12 +0800 Message-ID: <20250718020312.856168-1-lijiayi@kylinos.cn> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The original initialization sequence was: cpufreq_policy_online() acpi_cpufreq_cpu_init() acpi_processor_get_platform_limit() freq_qos_update_request(&perflib_req) blocking_notifier_call_chain(...) acpi_processor_ppc_init() freq_qos_add_request(&perflib_req) This caused a race condition where the QoS request was added after the initial platform limit update. The new sequence explicitly ensures: cpufreq_policy_online() acpi_cpufreq_cpu_init() acpi_processor_get_platform_limit() freq_qos_update_request(&perflib_req) blocking_notifier_call_chain(...) acpi_processor_ppc_init() freq_qos_add_request(&perflib_req) + acpi_processor_get_platform_limit() + freq_qos_update_request(&perflib_req) The critical change adds an immediate platform limit update after the QoS request is registered. This guarantees that the initial P-state constraint is applied before any subsequent updates, resolving the window where constraints could be applied out-of-order. Fixes: d15ce412737a ("ACPI: cpufreq: Switch to QoS requests instead of cpuf= req notifier") Signed-off-by: Jiayi Li --- drivers/acpi/processor_perflib.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perf= lib.c index 64b8d1e19594..3e7fe95c21d1 100644 --- a/drivers/acpi/processor_perflib.c +++ b/drivers/acpi/processor_perflib.c @@ -173,6 +173,9 @@ void acpi_processor_ppc_init(struct cpufreq_policy *pol= icy) { unsigned int cpu; =20 + if (ignore_ppc =3D=3D 1) + return; + for_each_cpu(cpu, policy->related_cpus) { struct acpi_processor *pr =3D per_cpu(processors, cpu); int ret; @@ -193,6 +196,11 @@ void acpi_processor_ppc_init(struct cpufreq_policy *po= licy) if (ret < 0) pr_err("Failed to add freq constraint for CPU%d (%d)\n", cpu, ret); + + ret =3D acpi_processor_get_platform_limit(pr); + if (ret) + pr_err("Failed to update freq constraint for CPU%d (%d)\n", + cpu, ret); } } =20 --=20 2.47.1