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| author | Steve Capper | 2013-05-07 15:46:03 +0200 |
|---|---|---|
| committer | Steve Capper | 2013-06-14 10:40:28 +0200 |
| commit | dfa5e237e935bc6712c9ac2f52a5469a0df85bcf (patch) | |
| tree | 277e0e8f1817893d115d901d1737461e86f255b9 | |
| parent | x86: mm: Remove general hugetlb code from x86. (diff) | |
| download | kernel-qcow2-linux-dfa5e237e935bc6712c9ac2f52a5469a0df85bcf.tar.gz kernel-qcow2-linux-dfa5e237e935bc6712c9ac2f52a5469a0df85bcf.tar.xz kernel-qcow2-linux-dfa5e237e935bc6712c9ac2f52a5469a0df85bcf.zip | |
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>
| -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 528454c2caa9..26ee56c80dc7 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, |