x86, mm: is_untracked_pat_range() takes a normal semiclosed range
is_untracked_pat_range() -- like its components, is_ISA_range() and is_GRU_range(), takes a normal semiclosed interval (>=, <) whereas the PAT code called it as if it took a closed range (>=, <=). Fix. Although this is a bug, I believe it is non-manifest, simply because none of the callers will call this with non-page-aligned addresses. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20091119202341.GA4420@sgi.com>
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@ -274,7 +274,7 @@ static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
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/*
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* PAT type is always WB for untracked ranges, so no need to check.
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*/
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if (x86_platform.is_untracked_pat_range(paddr, paddr + size - 1))
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if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
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return 1;
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/*
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@ -394,7 +394,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
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}
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/* Low ISA region is always mapped WB in page table. No need to track */
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if (x86_platform.is_untracked_pat_range(start, end - 1)) {
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if (x86_platform.is_untracked_pat_range(start, end)) {
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if (new_type)
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*new_type = _PAGE_CACHE_WB;
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return 0;
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@ -505,7 +505,7 @@ int free_memtype(u64 start, u64 end)
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return 0;
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/* Low ISA region is always mapped WB. No need to track */
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if (x86_platform.is_untracked_pat_range(start, end - 1))
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if (x86_platform.is_untracked_pat_range(start, end))
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return 0;
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is_range_ram = pat_pagerange_is_ram(start, end);
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@ -588,7 +588,7 @@ static unsigned long lookup_memtype(u64 paddr)
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int rettype = _PAGE_CACHE_WB;
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struct memtype *entry;
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if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE - 1))
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if (x86_platform.is_untracked_pat_range(paddr, paddr + PAGE_SIZE))
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return rettype;
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if (pat_pagerange_is_ram(paddr, paddr + PAGE_SIZE)) {
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