[PATCHv6 14/37] thp: introduce hpage_size() and hpage_mask()

Kirill A. Shutemov
2017-01-26T11:57:56Z

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@linux.intel.com>
---
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