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 <kirill.shutemov@xxxxxxxxxxxxxxx>
---
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 6f14de45b5ce..de2789b4402c 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -138,6 +138,20 @@ 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 fault_env *fe, pmd_t orig_pmd);
extern struct page *huge_zero_page;
@@ -163,6 +177,8 @@ void put_huge_zero_page(void);
#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
--
2.9.3
--
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