Merge tag 'edac_urgent_for_v5.9_rc3' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-microblaze.git] / include / linux / huge_mm.h

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 4673020..8a8bc46 100644 (file)
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -258,9 +258,36 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
        else
                return NULL;
 }
-static inline int hpage_nr_pages(struct page *page)
+
+/**
+ * thp_head - Head page of a transparent huge page.
+ * @page: Any page (tail, head or regular) found in the page cache.
+ */
+static inline struct page *thp_head(struct page *page)
+{
+       return compound_head(page);
+}
+
+/**
+ * thp_order - Order of a transparent huge page.
+ * @page: Head page of a transparent huge page.
+ */
+static inline unsigned int thp_order(struct page *page)
+{
+       VM_BUG_ON_PGFLAGS(PageTail(page), page);
+       if (PageHead(page))
+               return HPAGE_PMD_ORDER;
+       return 0;
+}
+
+/**
+ * thp_nr_pages - The number of regular pages in this huge page.
+ * @page: The head page of a huge page.
+ */
+static inline int thp_nr_pages(struct page *page)
 {
-       if (unlikely(PageTransHuge(page)))
+       VM_BUG_ON_PGFLAGS(PageTail(page), page);
+       if (PageHead(page))
                return HPAGE_PMD_NR;
        return 1;
 }
@@ -317,9 +344,21 @@ static inline struct list_head *page_deferred_list(struct page *page)
 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 
-static inline int hpage_nr_pages(struct page *page)
+static inline struct page *thp_head(struct page *page)
 {
-       VM_BUG_ON_PAGE(PageTail(page), page);
+       VM_BUG_ON_PGFLAGS(PageTail(page), page);
+       return page;
+}
+
+static inline unsigned int thp_order(struct page *page)
+{
+       VM_BUG_ON_PGFLAGS(PageTail(page), page);
+       return 0;
+}
+
+static inline int thp_nr_pages(struct page *page)
+{
+       VM_BUG_ON_PGFLAGS(PageTail(page), page);
        return 1;
 }
 
@@ -443,4 +482,15 @@ static inline bool thp_migration_supported(void)
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
+/**
+ * thp_size - Size of a transparent huge page.
+ * @page: Head page of a transparent huge page.
+ *
+ * Return: Number of bytes in this page.
+ */
+static inline unsigned long thp_size(struct page *page)
+{
+       return PAGE_SIZE << thp_order(page);
+}
+
 #endif /* _LINUX_HUGE_MM_H */