usb: uas: add support for more quirk flags
[platform/kernel/linux-rpi.git] / include / linux / hugetlb_cgroup.h
1 /*
2  * Copyright IBM Corporation, 2012
3  * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2.1 of the GNU Lesser General Public License
7  * as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12  *
13  */
14
15 #ifndef _LINUX_HUGETLB_CGROUP_H
16 #define _LINUX_HUGETLB_CGROUP_H
17
18 #include <linux/mmdebug.h>
19
20 struct hugetlb_cgroup;
21 /*
22  * Minimum page order trackable by hugetlb cgroup.
23  * At least 3 pages are necessary for all the tracking information.
24  */
25 #define HUGETLB_CGROUP_MIN_ORDER        2
26
27 #ifdef CONFIG_CGROUP_HUGETLB
28
29 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
30 {
31         VM_BUG_ON_PAGE(!PageHuge(page), page);
32
33         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
34                 return NULL;
35         return (struct hugetlb_cgroup *)page[2].private;
36 }
37
38 static inline
39 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
40 {
41         VM_BUG_ON_PAGE(!PageHuge(page), page);
42
43         if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
44                 return -1;
45         page[2].private = (unsigned long)h_cg;
46         return 0;
47 }
48
49 static inline bool hugetlb_cgroup_disabled(void)
50 {
51         return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
52 }
53
54 extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
55                                         struct hugetlb_cgroup **ptr);
56 extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
57                                          struct hugetlb_cgroup *h_cg,
58                                          struct page *page);
59 extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
60                                          struct page *page);
61 extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
62                                            struct hugetlb_cgroup *h_cg);
63 extern void hugetlb_cgroup_file_init(void) __init;
64 extern void hugetlb_cgroup_migrate(struct page *oldhpage,
65                                    struct page *newhpage);
66
67 #else
68 static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
69 {
70         return NULL;
71 }
72
73 static inline
74 int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
75 {
76         return 0;
77 }
78
79 static inline bool hugetlb_cgroup_disabled(void)
80 {
81         return true;
82 }
83
84 static inline int
85 hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
86                              struct hugetlb_cgroup **ptr)
87 {
88         return 0;
89 }
90
91 static inline void
92 hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
93                              struct hugetlb_cgroup *h_cg,
94                              struct page *page)
95 {
96 }
97
98 static inline void
99 hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
100 {
101 }
102
103 static inline void
104 hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
105                                struct hugetlb_cgroup *h_cg)
106 {
107 }
108
109 static inline void hugetlb_cgroup_file_init(void)
110 {
111 }
112
113 static inline void hugetlb_cgroup_migrate(struct page *oldhpage,
114                                           struct page *newhpage)
115 {
116 }
117
118 #endif  /* CONFIG_MEM_RES_CTLR_HUGETLB */
119 #endif