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| author |   Andreas Herrmann <andreas.herrmann3@amd.com> | 2008-06-10 16:05:18 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-06-12 10:14:22 +0200 |
| commit | 97cfab6ac4ddfda0d722393bbf46cc40bc332107 (patch) | |
| tree | 699f95483b968bfad891bca59ad46f74949543bc /arch/x86/kernel/cpu/addon_cpuid_features.c | |
| parent | x86: unconditionally enable PAT for AMD CPUs (diff) | |
| download | linux-dev-97cfab6ac4ddfda0d722393bbf46cc40bc332107.tar.xz linux-dev-97cfab6ac4ddfda0d722393bbf46cc40bc332107.zip | |
x86: PAT: fix ambiguous paranoia check in pat_init()
Starting with commit 8d4a4300854f3971502e81dacd930704cb88f606 (x86:
cleanup PAT cpu validation) the PAT CPU feature flag is not cleared
anymore. Now the error message
"PAT enabled, but CPU feature cleared"
in pat_init() is misleading.
Furthermore the current code does not check for existence of the PAT
CPU feature flag if a CPU is whitelisted in validate_pat_support.
This patch clears pat_wc_enabled if boot CPU has no PAT feature flag
and adapts the paranoia check.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/addon_cpuid_features.c')
| -rw-r--r-- | arch/x86/kernel/cpu/addon_cpuid_features.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c index 0fbd06241e07..2df461f06a52 100644 --- a/arch/x86/kernel/cpu/addon_cpuid_features.c +++ b/arch/x86/kernel/cpu/addon_cpuid_features.c @@ -53,6 +53,9 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c) #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: if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15)) @@ -64,8 +67,6 @@ void __cpuinit validate_pat_support(struct cpuinfo_x86 *c) return; } - pat_disable(cpu_has_pat ? - "PAT disabled. Not yet verified on this CPU type." : - "PAT not supported by CPU."); + pat_disable("PAT disabled. Not yet verified on this CPU type."); } #endif |