ACPI: processor: Move MWAIT quirk out of acpi_processor.c

Commit 2a2a6471 ("ACPI: Disable MWAIT via DMI on broken Compal board")
introduced a workaround for MWAIT for a specific x86 system.

Move the code outside of acpi_processor.c to acpi/x86/ directory for
consistency and rename the functions associated with it, so their names
start with "acpi_proc_quirk_" to make the goal obvious.

No intentional functional impact.
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
[ rjw: Subject and changelog edits, two function names changed ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/internal.h

@@ -153,6 +153,8 @@ int acpi_wakeup_device_init(void);
    -------------------------------------------------------------------------- */
 #ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC
 void acpi_early_processor_set_pdc(void);
+
+void acpi_proc_quirk_mwait_check(void);
 #else
 static inline void acpi_early_processor_set_pdc(void) {}
 #endif

drivers/acpi/processor_pdc.c

@@ -174,36 +174,9 @@ early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
 	return AE_OK;
 }
 
-static int __init set_no_mwait(const struct dmi_system_id *id)
-{
-	pr_notice("%s detected - disabling mwait for CPU C-states\n",
-		  id->ident);
-	boot_option_idle_override = IDLE_NOMWAIT;
-	return 0;
-}
-
-static const struct dmi_system_id processor_idle_dmi_table[] __initconst = {
-	{
-	set_no_mwait, "Extensa 5220", {
-	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
-	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
-	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
-	{},
-};
-
-static void __init processor_dmi_check(void)
-{
-	/*
-	 * Check whether the system is DMI table. If yes, OSPM
-	 * should not use mwait for CPU-states.
-	 */
-	dmi_check_system(processor_idle_dmi_table);
-}
-
 void __init acpi_early_processor_set_pdc(void)
 {
-	processor_dmi_check();
+	acpi_proc_quirk_mwait_check();
 
 	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 			    ACPI_UINT32_MAX,

drivers/acpi/x86/utils.c

@@ -518,3 +518,38 @@ bool acpi_quirk_skip_acpi_ac_and_battery(void)
 	return false;
 }
 EXPORT_SYMBOL_GPL(acpi_quirk_skip_acpi_ac_and_battery);
+
+/* This section provides a workaround for a specific x86 system
+ * which requires disabling of mwait to work correctly.
+ */
+static int __init acpi_proc_quirk_set_no_mwait(const struct dmi_system_id *id)
+{
+	pr_notice("%s detected - disabling mwait for CPU C-states\n",
+		  id->ident);
+	boot_option_idle_override = IDLE_NOMWAIT;
+	return 0;
+}
+
+static const struct dmi_system_id acpi_proc_quirk_mwait_dmi_table[] __initconst = {
+	{
+		.callback = acpi_proc_quirk_set_no_mwait,
+		.ident = "Extensa 5220",
+		.matches =  {
+			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
+			DMI_MATCH(DMI_BOARD_NAME, "Columbia"),
+		},
+		.driver_data = NULL,
+	},
+	{}
+};
+
+void __init acpi_proc_quirk_mwait_check(void)
+{
+	/*
+	 * Check whether the system is DMI table. If yes, OSPM
+	 * should not use mwait for CPU-states.
+	 */
+	dmi_check_system(acpi_proc_quirk_mwait_dmi_table);
+}