x86: pat cpu feature bit setting for known cpus

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 25 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 0dd87b8d6707..d999d7833bc2 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -309,6 +309,19 @@ static void __cpuinit early_get_cap(struct cpuinfo_x86 *c)
 
         }
 
+        clear_cpu_cap(c, X86_FEATURE_PAT);
+
+        switch (c->x86_vendor) {
+        case X86_VENDOR_AMD:
+                if (c->x86 >= 0xf && c->x86 <= 0x11)
+                        set_cpu_cap(c, X86_FEATURE_PAT);
+                break;
+        case X86_VENDOR_INTEL:
+                if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+                        set_cpu_cap(c, X86_FEATURE_PAT);
+                break;
+        }
+
 }
 
 /*
@@ -397,6 +410,18 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
                 init_scattered_cpuid_features(c);
         }
 
+        clear_cpu_cap(c, X86_FEATURE_PAT);
+
+        switch (c->x86_vendor) {
+        case X86_VENDOR_AMD:
+                if (c->x86 >= 0xf && c->x86 <= 0x11)
+                        set_cpu_cap(c, X86_FEATURE_PAT);
+                break;
+        case X86_VENDOR_INTEL:
+                if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+                        set_cpu_cap(c, X86_FEATURE_PAT);
+                break;
+        }
 }
 
 static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c)