Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6

[firefly-linux-kernel-4.4.55.git] / arch / x86 / kernel / process.c

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index cbcf013a0ec6b4e384f4d7acf4756ea3958326a8..d401f1d2d06ef47c1dba0a33f86679a33ab24fa9 100644 (file)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -526,44 +526,10 @@ static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
        return (edx & MWAIT_EDX_C1);
 }
 
-/*
- * Check for AMD CPUs, where APIC timer interrupt does not wake up CPU from C1e.
- * For more information see
- * - Erratum #400 for NPT family 0xf and family 0x10 CPUs
- * - Erratum #365 for family 0x11 (not affected because C1e not in use)
- */
-static int __cpuinit check_c1e_idle(const struct cpuinfo_x86 *c)
-{
-       u64 val;
-       if (c->x86_vendor != X86_VENDOR_AMD)
-               goto no_c1e_idle;
-
-       /* Family 0x0f models < rev F do not have C1E */
-       if (c->x86 == 0x0F && c->x86_model >= 0x40)
-               return 1;
-
-       if (c->x86 == 0x10) {
-               /*
-                * check OSVW bit for CPUs that are not affected
-                * by erratum #400
-                */
-               if (cpu_has(c, X86_FEATURE_OSVW)) {
-                       rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, val);
-                       if (val >= 2) {
-                               rdmsrl(MSR_AMD64_OSVW_STATUS, val);
-                               if (!(val & BIT(1)))
-                                       goto no_c1e_idle;
-                       }
-               }
-               return 1;
-       }
-
-no_c1e_idle:
-       return 0;
-}
+bool c1e_detected;
+EXPORT_SYMBOL(c1e_detected);
 
 static cpumask_var_t c1e_mask;
-static int c1e_detected;
 
 void c1e_remove_cpu(int cpu)
 {
@@ -585,12 +551,12 @@ static void c1e_idle(void)
                u32 lo, hi;
 
                rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
+
                if (lo & K8_INTP_C1E_ACTIVE_MASK) {
-                       c1e_detected = 1;
+                       c1e_detected = true;
                        if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
                                mark_tsc_unstable("TSC halt in AMD C1E");
                        printk(KERN_INFO "System has AMD C1E enabled\n");
-                       set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
                }
        }
 
@@ -639,7 +605,8 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
                 */
                printk(KERN_INFO "using mwait in idle threads.\n");
                pm_idle = mwait_idle;
-       } else if (check_c1e_idle(c)) {
+       } else if (cpu_has_amd_erratum(amd_erratum_400)) {
+               /* E400: APIC timer interrupt does not wake up CPU from C1e */
                printk(KERN_INFO "using C1E aware idle routine\n");
                pm_idle = c1e_idle;
        } else