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Diffstat (limited to 'arch/x86/kernel/cpu/common.c')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 25581dcb280e..5613afb94bd8 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -575,12 +575,23 @@ void __init early_cpu_init(void) } early_identify_cpu(&boot_cpu_data); + +#ifdef CONFIG_KMEMCHECK + /* + * We need 4K granular PTEs for kmemcheck: + */ + setup_clear_cpu_cap(X86_FEATURE_PSE); +#endif } /* * The NOPL instruction is supposed to exist on all CPUs with * family >= 6; unfortunately, that's not true in practice because * of early VIA chips and (more importantly) broken virtualizers that + * + * Note: no 64-bit chip is known to lack these, but put the code here + * for consistency with 32 bits, and to make it utterly trivial to + * diagnose the problem should it ever surface. * are not easy to detect. In the latter case it doesn't even *fail* * reliably, so probing for it doesn't even work. Disable it completely * unless we can find a reliable way to detect all the broken cases. |