From 6ffbb45826f5d9ae09aa60cd88594b7816c96190 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Fri, 14 Aug 2020 17:30:30 -0700 Subject: mm: add thp_order This function returns the order of a transparent huge page. It compiles to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled. Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton Reviewed-by: William Kucharski Reviewed-by: Zi Yan Cc: David Hildenbrand Cc: Mike Kravetz Cc: "Kirill A. Shutemov" Link: http://lkml.kernel.org/r/20200629151959.15779-4-willy@infradead.org Signed-off-by: Linus Torvalds --- include/linux/huge_mm.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'include/linux') diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 467302056e17..9521cfdf18ca 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -258,6 +258,19 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud, else return NULL; } + +/** + * 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; +} + static inline int hpage_nr_pages(struct page *page) { if (unlikely(PageTransHuge(page))) @@ -317,6 +330,12 @@ 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 unsigned int thp_order(struct page *page) +{ + VM_BUG_ON_PGFLAGS(PageTail(page), page); + return 0; +} + static inline int hpage_nr_pages(struct page *page) { VM_BUG_ON_PAGE(PageTail(page), page); -- cgit v1.2.3