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author | Paul Mundt <lethal@linux-sh.org> | 2008-10-31 16:18:02 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2008-10-31 16:18:02 +0900 |
commit | 0803d540db06f53acd2fabf1347d5b665218f14a (patch) | |
tree | f5f8e5510a76bb59d3583478961daf5afc32df08 /arch/x86/mm/pat.c | |
parent | a8884e3415c29c58a5875d54c109c4a7fcaa6fb4 (diff) | |
parent | 721d5dfe7e516954c501d5e9d0dfab379cf4241a (diff) |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
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 |