summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/xen/xen-acpi-processor.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/drivers/xen/xen-acpi-processor.c')
-rw-r--r--kernel/drivers/xen/xen-acpi-processor.c35
1 files changed, 3 insertions, 32 deletions
diff --git a/kernel/drivers/xen/xen-acpi-processor.c b/kernel/drivers/xen/xen-acpi-processor.c
index 70fa43800..611f9c11d 100644
--- a/kernel/drivers/xen/xen-acpi-processor.c
+++ b/kernel/drivers/xen/xen-acpi-processor.c
@@ -423,36 +423,7 @@ upload:
return 0;
}
-static int __init check_prereq(void)
-{
- struct cpuinfo_x86 *c = &cpu_data(0);
-
- if (!xen_initial_domain())
- return -ENODEV;
-
- if (!acpi_gbl_FADT.smi_command)
- return -ENODEV;
-
- if (c->x86_vendor == X86_VENDOR_INTEL) {
- if (!cpu_has(c, X86_FEATURE_EST))
- return -ENODEV;
- return 0;
- }
- if (c->x86_vendor == X86_VENDOR_AMD) {
- /* Copied from powernow-k8.h, can't include ../cpufreq/powernow
- * as we get compile warnings for the static functions.
- */
-#define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007
-#define USE_HW_PSTATE 0x00000080
- u32 eax, ebx, ecx, edx;
- cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
- if ((edx & USE_HW_PSTATE) != USE_HW_PSTATE)
- return -ENODEV;
- return 0;
- }
- return -ENODEV;
-}
/* acpi_perf_data is a pointer to percpu data. */
static struct acpi_processor_performance __percpu *acpi_perf_data;
@@ -509,10 +480,10 @@ struct notifier_block xen_acpi_processor_resume_nb = {
static int __init xen_acpi_processor_init(void)
{
unsigned int i;
- int rc = check_prereq();
+ int rc;
- if (rc)
- return rc;
+ if (!xen_initial_domain())
+ return -ENODEV;
nr_acpi_bits = get_max_acpi_id() + 1;
acpi_ids_done = kcalloc(BITS_TO_LONGS(nr_acpi_bits), sizeof(unsigned long), GFP_KERNEL);