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>
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@ -123,7 +123,7 @@ extern void __split_huge_page_pmd(struct vm_area_struct *vma,
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} while (0)
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extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd);
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#if HPAGE_PMD_ORDER > MAX_ORDER
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#if HPAGE_PMD_ORDER >= MAX_ORDER
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#error "hugepages can't be allocated by the buddy allocator"
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#endif
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extern int hugepage_madvise(struct vm_area_struct *vma,
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