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| author | Ingo Molnar <mingo@elte.hu> | 2010-05-13 08:11:26 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-13 08:11:29 +0200 |
| commit | ad56b0797e67df5e04b2f1a1e02900145c5c16f2 (patch) | |
| tree | 1569bed80a4de531afb88cac9d60ef8bd0aa89f2 /arch/x86/kernel/cpu/intel.c | |
| parent | 668eb65f092902eb7dd526af73d4a7f025a94612 (diff) | |
| parent | b57f95a38233a2e73b679bea4a5453a1cc2a1cc9 (diff) | |
| download | kernel_samsung_smdk4412-ad56b0797e67df5e04b2f1a1e02900145c5c16f2.tar.gz kernel_samsung_smdk4412-ad56b0797e67df5e04b2f1a1e02900145c5c16f2.tar.bz2 kernel_samsung_smdk4412-ad56b0797e67df5e04b2f1a1e02900145c5c16f2.zip | |
Merge commit 'v2.6.34-rc7' into tracing/core
Merge reason: Update from -rc5 to -rc7.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/intel.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 7e1cca13af3..1366c7cfd48 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -47,6 +47,27 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c) (c->x86 == 0x6 && c->x86_model >= 0x0e)) set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); + /* + * Atom erratum AAE44/AAF40/AAG38/AAH41: + * + * A race condition between speculative fetches and invalidating + * a large page. This is worked around in microcode, but we + * need the microcode to have already been loaded... so if it is + * not, recommend a BIOS update and disable large pages. + */ + if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2) { + u32 ucode, junk; + + wrmsr(MSR_IA32_UCODE_REV, 0, 0); + sync_core(); + rdmsr(MSR_IA32_UCODE_REV, junk, ucode); + + if (ucode < 0x20e) { + printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n"); + clear_cpu_cap(c, X86_FEATURE_PSE); + } + } + #ifdef CONFIG_X86_64 set_cpu_cap(c, X86_FEATURE_SYSENTER32); #else |