include/linux/page_owner.h

   1 #ifndef __LINUX_PAGE_OWNER_H
   2 #define __LINUX_PAGE_OWNER_H
   3
   4 #include <linux/jump_label.h>
   5
   6 #ifdef CONFIG_PAGE_OWNER
   7 extern struct static_key_false page_owner_inited;
   8 extern struct page_ext_operations page_owner_ops;
   9
  10 extern void __reset_page_owner(struct page *page, unsigned int order);
  11 extern void __set_page_owner(struct page *page,
  12                         unsigned int order, gfp_t gfp_mask);
  13 extern gfp_t __get_page_owner_gfp(struct page *page);
  14
  15 static inline void reset_page_owner(struct page *page, unsigned int order)
  16 {
  17         if (static_branch_unlikely(&page_owner_inited))
  18                 __reset_page_owner(page, order);
  19 }
  20
  21 static inline void set_page_owner(struct page *page,
  22                         unsigned int order, gfp_t gfp_mask)
  23 {
  24         if (static_branch_unlikely(&page_owner_inited))
  25                 __set_page_owner(page, order, gfp_mask);
  26 }
  27
  28 static inline gfp_t get_page_owner_gfp(struct page *page)
  29 {
  30         if (static_branch_unlikely(&page_owner_inited))
  31                 return __get_page_owner_gfp(page);
  32         else
  33                 return 0;
  34 }
  35 #else
  36 static inline void reset_page_owner(struct page *page, unsigned int order)
  37 {
  38 }
  39 static inline void set_page_owner(struct page *page,
  40                         unsigned int order, gfp_t gfp_mask)
  41 {
  42 }
  43 static inline gfp_t get_page_owner_gfp(struct page *page)
  44 {
  45         return 0;
  46 }
  47
  48 #endif /* CONFIG_PAGE_OWNER */
  49 #endif /* __LINUX_PAGE_OWNER_H */