[PATCHv6 14/37] thp: introduce hpage_size() and hpage_mask()
From: Kirill A. Shutemov <hidden>
Date: 2017-01-26 11:57:56
Also in:
linux-ext4, linux-fsdevel, linux-mm, lkml
Subsystem:
memory management - thp (transparent huge page), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds
Introduce new helpers which return size/mask of the page: HPAGE_PMD_SIZE/HPAGE_PMD_MASK if the page is PageTransHuge() and PAGE_SIZE/PAGE_MASK otherwise. Signed-off-by: Kirill A. Shutemov <redacted> --- include/linux/huge_mm.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 97e478d6b690..e5c9c26d2439 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h@@ -142,6 +142,20 @@ static inline int hpage_nr_pages(struct page *page) return 1; } +static inline int hpage_size(struct page *page) +{ + if (unlikely(PageTransHuge(page))) + return HPAGE_PMD_SIZE; + return PAGE_SIZE; +} + +static inline unsigned long hpage_mask(struct page *page) +{ + if (unlikely(PageTransHuge(page))) + return HPAGE_PMD_MASK; + return PAGE_MASK; +} + extern int do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd); extern struct page *huge_zero_page;
@@ -167,6 +181,8 @@ void mm_put_huge_zero_page(struct mm_struct *mm); #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; }) #define hpage_nr_pages(x) 1 +#define hpage_size(x) PAGE_SIZE +#define hpage_mask(x) PAGE_MASK #define transparent_hugepage_enabled(__vma) 0
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2.11.0