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>
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 2003449..c6fe1e4 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -962,12 +962,19 @@
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;
}