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author | H. Peter Anvin <hpa@linux.intel.com> | 2009-01-22 16:17:05 -0800 |
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committer | H. Peter Anvin <hpa@linux.intel.com> | 2009-01-23 18:07:45 -0800 |
commit | 75a048119e76540d73132cfc8e0fa0c0a8bb6c83 (patch) | |
tree | 2a4d88809efae435e6fe8e33e630f92d76742c9d /arch/x86/kernel/cpu/addon_cpuid_features.c | |
parent | b1882e68d17a93b523dce09c3a181319aace2f0e (diff) | |
download | kernel_samsung_smdk4412-75a048119e76540d73132cfc8e0fa0c0a8bb6c83.zip kernel_samsung_smdk4412-75a048119e76540d73132cfc8e0fa0c0a8bb6c83.tar.gz kernel_samsung_smdk4412-75a048119e76540d73132cfc8e0fa0c0a8bb6c83.tar.bz2 |
x86: handle PAT more like other CPU features
Impact: Cleanup
When PAT was originally introduced, it was handled specially for a few
reasons:
- PAT bugs are hard to track down, so we wanted to maintain a
whitelist of CPUs.
- The i386 and x86-64 CPUID code was not yet unified.
Both of these are now obsolete, so handle PAT like any other features,
including ordinary feature blacklisting due to known bugs.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu/addon_cpuid_features.c')
-rw-r--r-- | arch/x86/kernel/cpu/addon_cpuid_features.c | 34 |
1 files changed, 0 insertions, 34 deletions
diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c index 2cf2363..4e581fd 100644 --- a/arch/x86/kernel/cpu/addon_cpuid_features.c +++ b/arch/x86/kernel/cpu/addon_cpuid_features.c @@ -143,37 +143,3 @@ void __cpuinit detect_extended_topology(struct cpuinfo_x86 *c) return; #endif } - -#ifdef CONFIG_X86_PAT -void __cpuinit validate_pat_support(struct cpuinfo_x86 *c) -{ - if (!cpu_has_pat) - pat_disable("PAT not supported by CPU."); - - switch (c->x86_vendor) { - case X86_VENDOR_INTEL: - /* - * There is a known erratum on Pentium III and Core Solo - * and Core Duo CPUs. - * " Page with PAT set to WC while associated MTRR is UC - * may consolidate to UC " - * Because of this erratum, it is better to stick with - * setting WC in MTRR rather than using PAT on these CPUs. - * - * Enable PAT WC only on P4, Core 2 or later CPUs. - */ - if (c->x86 > 0x6 || (c->x86 == 6 && c->x86_model >= 15)) - return; - - pat_disable("PAT WC disabled due to known CPU erratum."); - return; - - case X86_VENDOR_AMD: - case X86_VENDOR_CENTAUR: - case X86_VENDOR_TRANSMETA: - return; - } - - pat_disable("PAT disabled. Not yet verified on this CPU type."); -} -#endif |