Subject: [PATCH 1/5] x86: unconditionally enable PAT for AMD CPUs

If PAT support is advertised it should just work. No errata known.

Signed-off-by: Andreas Herrmann <[email protected]>
---
arch/x86/kernel/cpu/addon_cpuid_features.c | 5 +----
1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index d8b3e4a..0fbd062 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -54,14 +54,11 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
{
switch (c->x86_vendor) {
- case X86_VENDOR_AMD:
- if (c->x86 >= 0xf && c->x86 <= 0x11)
- return;
- break;
case X86_VENDOR_INTEL:
if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
return;
break;
+ case X86_VENDOR_AMD:
case X86_VENDOR_CENTAUR:
case X86_VENDOR_TRANSMETA:
return;
--
1.5.5.3



2008-06-10 21:41:45

by H. Peter Anvin

[permalink] [raw]
Subject: Re: [PATCH 1/5] x86: unconditionally enable PAT for AMD CPUs

Andreas Herrmann wrote:
> If PAT support is advertised it should just work. No errata known.

This kills off the remainder of the whitelist (which is good), please
actually this; this function doesn't do anything anymore and should be
removed.

-hpa