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, 7 insertions, 0 deletions

diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 20034493b5ad..c6fe1e4bc7c2 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -962,12 +962,19 @@ static void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
         if (c->extended_cpuid_level >= 0x80000007)
                 c->x86_power = cpuid_edx(0x80000007);
 
+
+        clear_cpu_cap(c, X86_FEATURE_PAT);
+
         switch (c->x86_vendor) {
         case X86_VENDOR_AMD:
                 early_init_amd(c);
+                if (c->x86 >= 0xf && c->x86 <= 0x11)
+                        set_cpu_cap(c, X86_FEATURE_PAT);
                 break;
         case X86_VENDOR_INTEL:
                 early_init_intel(c);
+                if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
+                        set_cpu_cap(c, X86_FEATURE_PAT);
                 break;
         }