x86: enable PAT for amd k8 and fam10h

make known_pat_cpu to think amd k8 and fam10h is ok too.

also make tom2 below to be WRBACK

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

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 57a2af36d6ee..0648a2225b09 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -47,6 +47,12 @@ static int pat_known_cpu(void)
                         return 1;
                 }
         }
+        if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+             boot_cpu_data.x86 >= 0xf && boot_cpu_data.x86 <= 0x11) {
+                if (cpu_has_pat) {
+                        return 1;
+                }
+        }
 
         pat_wc_enabled = 0;
         printk(KERN_INFO "CPU and/or kernel does not support PAT.\n");