x86/acpi/cstate: Remove open coded check for cpu_feature_enabled()

superm1 · rafaeljw · commit 5b87014e9999 · 2025-09-22T19:16:51.000+02:00
acpi_processor_power_init_bm_check() has an open coded implementation
of cpu_feature_enabled() to detect X86_FEATURE_ZEN.

Switch to using cpu_feature_enabled().

Signed-off-by: Mario Limonciello (AMD) &lt;superm1@kernel.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
@@ -89,7 +89,7 @@ void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 		 */
 		flags->bm_control = 0;
 	}
-	if (c->x86_vendor == X86_VENDOR_AMD && c->x86 >= 0x17) {
+	if (cpu_feature_enabled(X86_FEATURE_ZEN)) {
 		/*
 		 * For all AMD Zen or newer CPUs that support C3, caches
 		 * should not be flushed by software while entering C3

Original file line number	Diff line number	Diff line change
`@@ -89,7 +89,7 @@ void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,`
`89`	`89`	`*/`
`90`	`90`	`flags->bm_control = 0;`
`91`	`91`	`}`
`92`		`- if (c->x86_vendor == X86_VENDOR_AMD && c->x86 >= 0x17) {`
	`92`	`+ if (cpu_feature_enabled(X86_FEATURE_ZEN)) {`
`93`	`93`	`/*`
`94`	`94`	`* For all AMD Zen or newer CPUs that support C3, caches`
`95`	`95`	`* should not be flushed by software while entering C3`