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Wysocki" , Viresh Kumar CC: "open list:AMD PSTATE DRIVER" , Perry Yuan , open list , "Mario Limonciello" Subject: [PATCH v3 1/6] cpufreq: Export acpu_cpufreq_exit for other drivers to call Date: Thu, 14 Apr 2022 11:47:56 -0500 Message-ID: <20220414164801.1051-2-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220414164801.1051-1-mario.limonciello@amd.com> References: <20220414164801.1051-1-mario.limonciello@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 93a64e5b-59b8-44f4-c3c6-08da1e3690f3 X-MS-TrafficTypeDiagnostic: BYAPR12MB2613:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230001)(4636009)(36840700001)(40470700004)(46966006)(2906002)(40460700003)(508600001)(5660300002)(44832011)(8936002)(82310400005)(6666004)(1076003)(81166007)(186003)(26005)(16526019)(7696005)(2616005)(356005)(54906003)(110136005)(86362001)(83380400001)(36860700001)(426003)(316002)(70206006)(8676002)(47076005)(336012)(36756003)(4326008)(70586007)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Apr 2022 16:48:13.4683 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 93a64e5b-59b8-44f4-c3c6-08da1e3690f3 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT068.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB2613 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, the only way to load an alternative cpufreq driver is to unload acpi-cpufreq first. Loosen that restriction to allow other kernel modules to unregister a registered driver. Signed-off-by: Mario Limonciello --- v2->v3: * Move to include header * Create a new symbol to prevent NX protected page fault calling exit function from other modules. v1->v2: * Export symbol instead of changing internals drivers/cpufreq/acpi-cpufreq.c | 10 ++++++++-- include/linux/cpufreq.h | 3 +++ 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 3d514b82d055..38358ed1f932 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -1033,7 +1033,7 @@ static int __init acpi_cpufreq_init(void) return ret; } -static void __exit acpi_cpufreq_exit(void) +void acpi_cpufreq_exit(void) { pr_debug("%s\n", __func__); @@ -1043,6 +1043,12 @@ static void __exit acpi_cpufreq_exit(void) free_acpi_perf_data(); } +EXPORT_SYMBOL_GPL(acpi_cpufreq_exit); + +void __exit acpi_cpufreq_module_exit(void) +{ + acpi_cpufreq_exit(); +} module_param(acpi_pstate_strict, uint, 0644); MODULE_PARM_DESC(acpi_pstate_strict, @@ -1050,7 +1056,7 @@ MODULE_PARM_DESC(acpi_pstate_strict, "performed during frequency changes."); late_initcall(acpi_cpufreq_init); -module_exit(acpi_cpufreq_exit); +module_exit(acpi_cpufreq_module_exit); static const struct x86_cpu_id __maybe_unused acpi_cpufreq_ids[] = { X86_MATCH_FEATURE(X86_FEATURE_ACPI, NULL), diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 35c7d6db4139..223bf9760117 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -273,6 +273,9 @@ static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy unsigned int new_freq) { } #endif /* CONFIG_CPU_FREQ_STAT */ +#if defined(CONFIG_X86_ACPI_CPUFREQ) || defined(CONFIG_X86_ACPI_CPUFREQ_MODULE) +void acpi_cpufreq_exit(void); +#endif /********************************************************************* * CPUFREQ DRIVER INTERFACE * *********************************************************************/ -- 2.34.1