include/linux/swap_cgroup.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_SWAP_CGROUP_H
   3 #define __LINUX_SWAP_CGROUP_H
   4
   5 #include <linux/swap.h>
   6
   7 #if defined(CONFIG_MEMCG) && defined(CONFIG_SWAP)
   8
   9 extern void swap_cgroup_record(struct folio *folio, swp_entry_t ent);
  10 extern unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents);
  11 extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
  12 extern int swap_cgroup_swapon(int type, unsigned long max_pages);
  13 extern void swap_cgroup_swapoff(int type);
  14
  15 #else
  16
  17 static inline
  18 void swap_cgroup_record(struct folio *folio, swp_entry_t ent)
  19 {
  20 }
  21
  22 static inline
  23 unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents)
  24 {
  25         return 0;
  26 }
  27
  28 static inline
  29 unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
  30 {
  31         return 0;
  32 }
  33
  34 static inline int
  35 swap_cgroup_swapon(int type, unsigned long max_pages)
  36 {
  37         return 0;
  38 }
  39
  40 static inline void swap_cgroup_swapoff(int type)
  41 {
  42         return;
  43 }
  44
  45 #endif
  46
  47 #endif /* __LINUX_SWAP_CGROUP_H */