rtlwifi: rtl8192cu: Convert inline routines to little-endian words
[linux-2.6-microblaze.git] / include / linux / page_counter.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PAGE_COUNTER_H
3 #define _LINUX_PAGE_COUNTER_H
4
5 #include <linux/atomic.h>
6 #include <linux/kernel.h>
7 #include <asm/page.h>
8
9 struct page_counter {
10         atomic_long_t usage;
11         unsigned long min;
12         unsigned long low;
13         unsigned long max;
14         struct page_counter *parent;
15
16         /* effective memory.min and memory.min usage tracking */
17         unsigned long emin;
18         atomic_long_t min_usage;
19         atomic_long_t children_min_usage;
20
21         /* effective memory.low and memory.low usage tracking */
22         unsigned long elow;
23         atomic_long_t low_usage;
24         atomic_long_t children_low_usage;
25
26         /* legacy */
27         unsigned long watermark;
28         unsigned long failcnt;
29 };
30
31 #if BITS_PER_LONG == 32
32 #define PAGE_COUNTER_MAX LONG_MAX
33 #else
34 #define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE)
35 #endif
36
37 static inline void page_counter_init(struct page_counter *counter,
38                                      struct page_counter *parent)
39 {
40         atomic_long_set(&counter->usage, 0);
41         counter->max = PAGE_COUNTER_MAX;
42         counter->parent = parent;
43 }
44
45 static inline unsigned long page_counter_read(struct page_counter *counter)
46 {
47         return atomic_long_read(&counter->usage);
48 }
49
50 void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
51 void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
52 bool page_counter_try_charge(struct page_counter *counter,
53                              unsigned long nr_pages,
54                              struct page_counter **fail);
55 void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
56 void page_counter_set_min(struct page_counter *counter, unsigned long nr_pages);
57 void page_counter_set_low(struct page_counter *counter, unsigned long nr_pages);
58 int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages);
59 int page_counter_memparse(const char *buf, const char *max,
60                           unsigned long *nr_pages);
61
62 static inline void page_counter_reset_watermark(struct page_counter *counter)
63 {
64         counter->watermark = page_counter_read(counter);
65 }
66
67 #endif /* _LINUX_PAGE_COUNTER_H */