1 files changed, 8 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c6eb02e69875..83b217c7225f 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -358,7 +358,7 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
 #endif
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_PCI)
         /* check CPU config space for extended APIC ID */
-        if (c->x86 >= 0xf) {
+        if (cpu_has_apic && c->x86 >= 0xf) {
                 unsigned int val;
                 val = read_pci_config(0, 24, 0, 0x68);
                 if ((val & ((1 << 17) | (1 << 18))) == ((1 << 17) | (1 << 18)))
@@ -402,6 +402,13 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
                 level = cpuid_eax(1);
                 if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
                         set_cpu_cap(c, X86_FEATURE_REP_GOOD);
+
+                /*
+                 * Some BIOSes incorrectly force this feature, but only K8
+                 * revision D (model = 0x14) and later actually support it.
+                 */
+                if (c->x86_model < 0x14)
+                        clear_cpu_cap(c, X86_FEATURE_LAHF_LM);
         }
         if (c->x86 == 0x10 || c->x86 == 0x11)
                 set_cpu_cap(c, X86_FEATURE_REP_GOOD);