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mm: thp: Correct the HPAGE_PMD_ORDER check.

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All Transparent Huge Pages are allocated by the buddy allocator.

A compile time check is in place that fails when the order of a
transparent huge page is too large to be allocated by the buddy
allocator. Unfortunately that compile time check passes when:
HPAGE_PMD_ORDER == MAX_ORDER
( which is incorrect as the buddy allocator can only allocate
memory of order strictly less than MAX_ORDER. )

This patch updates the compile time check to fail in the above
case.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Steve Capper 2013-05-07 14:46:03 +01:00
parent 53313b2c91
commit dfa5e237e9
1 changed files with 1 additions and 1 deletions
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2
include/linux/huge_mm.h
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@ -123,7 +123,7 @@ extern void __split_huge_page_pmd(struct vm_area_struct *vma,
} while (0)
extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
pmd_t *pmd);
#if HPAGE_PMD_ORDER > MAX_ORDER
#if HPAGE_PMD_ORDER >= MAX_ORDER
#error "hugepages can't be allocated by the buddy allocator"
#endif
extern int hugepage_madvise(struct vm_area_struct *vma,