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 #ifdef CONFIG_MEMCG_SWAP
   8
   9 extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
  10                                         unsigned short old, unsigned short new);
  11 extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
  12                                          unsigned int nr_ents);
  13 extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
  14 extern int swap_cgroup_swapon(int type, unsigned long max_pages);
  15 extern void swap_cgroup_swapoff(int type);
  16
  17 #else
  18
  19 static inline
  20 unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
  21                                   unsigned int nr_ents)
  22 {
  23         return 0;
  24 }
  25
  26 static inline
  27 unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
  28 {
  29         return 0;
  30 }
  31
  32 static inline int
  33 swap_cgroup_swapon(int type, unsigned long max_pages)
  34 {
  35         return 0;
  36 }
  37
  38 static inline void swap_cgroup_swapoff(int type)
  39 {
  40         return;
  41 }
  42
  43 #endif /* CONFIG_MEMCG_SWAP */
  44
  45 #endif /* __LINUX_SWAP_CGROUP_H */