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
9extern void swap_cgroup_record(struct folio *folio, unsigned short id, swp_entry_t ent);
10extern unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents);
11extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
12extern int swap_cgroup_swapon(int type, unsigned long max_pages);
13extern void swap_cgroup_swapoff(int type);
14
15#else
16
17static inline
18void swap_cgroup_record(struct folio *folio, unsigned short id, swp_entry_t ent)
19{
20}
21
22static inline
23unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents)
24{
25 return 0;
26}
27
28static inline
29unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
30{
31 return 0;
32}
33
34static inline int
35swap_cgroup_swapon(int type, unsigned long max_pages)
36{
37 return 0;
38}
39
40static inline void swap_cgroup_swapoff(int type)
41{
42 return;
43}
44
45#endif
46
47#endif /* __LINUX_SWAP_CGROUP_H */
48

source code of linux/include/linux/swap_cgroup.h