diff options
| author | Steve Capper <steve.capper@linaro.org> | 2013-05-07 14:46:03 +0100 |
|---|---|---|
| committer | Steve Capper <steve.capper@linaro.org> | 2014-03-05 15:03:10 +0800 |
| commit | 855b2b7fea77794f3bec69095785e94577447211 (patch) | |
| tree | 0a23aa851b35388dff561018f769a80d988fd5eb /include/linux | |
| parent | 409fba2624e5fe66eb1e86005801acbba65eb64c (diff) | |
mm: thp: Correct the HPAGE_PMD_ORDER check.
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/huge_mm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 528454c2caa..26ee56c80dc 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -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, |