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| author | Ingo Molnar <mingo@elte.hu> | 2008-11-20 09:03:38 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-20 09:03:38 +0100 |
| commit | 90accd6fabf9b2fa2705945a4c601877a75d43bf (patch) | |
| tree | d393cb54f0228b1313139e4e14adf4f5cf236b59 /arch/x86/mm/pat.c | |
| parent | b43d196c4d3fe46d6dda7c987c47792612b80b1b (diff) | |
| parent | ee2f6cc7f9ea2542ad46070ed62ba7aa04d08871 (diff) | |
Merge branch 'linus' into x86/memory-corruption-check
Diffstat (limited to 'arch/x86/mm/pat.c')
| -rw-r--r-- | arch/x86/mm/pat.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index 738fd0f2495..eb1bf000d12 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -481,12 +481,16 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size) return 1; } #else +/* This check is needed to avoid cache aliasing when PAT is enabled */ static inline int range_is_allowed(unsigned long pfn, unsigned long size) { u64 from = ((u64)pfn) << PAGE_SHIFT; u64 to = from + size; u64 cursor = from; + if (!pat_enabled) + return 1; + while (cursor < to) { if (!devmem_is_allowed(pfn)) { printk(KERN_INFO |