Re: [PATCH] x86: enable PAT for amd k8 and fam10h
From: H. Peter Anvin
Date: Mon Mar 24 2008 - 21:31:03 EST
Yinghai Lu wrote:
[PATCH] 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
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index f74505f..a9e1a27 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -49,6 +49,12 @@ 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");
This really should be handled through a CPU flag. Specifically, it
should be handled by disabling the PAT flag if PAT is unusable or
suspect of being unusable; it should *NOT* be stashed away in a
completely separate piece of code.
-hpa
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