/* SPDX-License-Identifier: GPL-2.0 */
  #ifndef __LINUX_SWAP_CGROUP_H
  #define __LINUX_SWAP_CGROUP_H
  
  #include <linux/swap.h>
  
  #ifdef CONFIG_MEMCG_SWAP
  
  extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
  					unsigned short old, unsigned short new);
  extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
  					 unsigned int nr_ents);
  extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
  extern int swap_cgroup_swapon(int type, unsigned long max_pages);
  extern void swap_cgroup_swapoff(int type);
  
  #else
  
  static inline
  unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
  				  unsigned int nr_ents)
  {
  	return 0;
  }
  
  static inline
  unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
  {
  	return 0;
  }
  
  static inline int
  swap_cgroup_swapon(int type, unsigned long max_pages)
  {
  	return 0;
  }
  
  static inline void swap_cgroup_swapoff(int type)
  {
  	return;
  }
  
  #endif /* CONFIG_MEMCG_SWAP */
  
  #endif /* __LINUX_SWAP_CGROUP_H */