Root/
1 | #ifndef _FLEX_ARRAY_H |
2 | #define _FLEX_ARRAY_H |
3 | |
4 | #include <linux/types.h> |
5 | #include <asm/page.h> |
6 | |
7 | #define FLEX_ARRAY_PART_SIZE PAGE_SIZE |
8 | #define FLEX_ARRAY_BASE_SIZE PAGE_SIZE |
9 | |
10 | struct flex_array_part; |
11 | |
12 | /* |
13 | * This is meant to replace cases where an array-like |
14 | * structure has gotten too big to fit into kmalloc() |
15 | * and the developer is getting tempted to use |
16 | * vmalloc(). |
17 | */ |
18 | |
19 | struct flex_array { |
20 | union { |
21 | struct { |
22 | int element_size; |
23 | int total_nr_elements; |
24 | struct flex_array_part *parts[]; |
25 | }; |
26 | /* |
27 | * This little trick makes sure that |
28 | * sizeof(flex_array) == PAGE_SIZE |
29 | */ |
30 | char padding[FLEX_ARRAY_BASE_SIZE]; |
31 | }; |
32 | }; |
33 | |
34 | /* Number of bytes left in base struct flex_array, excluding metadata */ |
35 | #define FLEX_ARRAY_BASE_BYTES_LEFT \ |
36 | (FLEX_ARRAY_BASE_SIZE - offsetof(struct flex_array, parts)) |
37 | |
38 | /* Number of pointers in base to struct flex_array_part pages */ |
39 | #define FLEX_ARRAY_NR_BASE_PTRS \ |
40 | (FLEX_ARRAY_BASE_BYTES_LEFT / sizeof(struct flex_array_part *)) |
41 | |
42 | /* Number of elements of size that fit in struct flex_array_part */ |
43 | #define FLEX_ARRAY_ELEMENTS_PER_PART(size) \ |
44 | (FLEX_ARRAY_PART_SIZE / size) |
45 | |
46 | /* |
47 | * Defines a statically allocated flex array and ensures its parameters are |
48 | * valid. |
49 | */ |
50 | #define DEFINE_FLEX_ARRAY(__arrayname, __element_size, __total) \ |
51 | struct flex_array __arrayname = { { { \ |
52 | .element_size = (__element_size), \ |
53 | .total_nr_elements = (__total), \ |
54 | } } }; \ |
55 | static inline void __arrayname##_invalid_parameter(void) \ |
56 | { \ |
57 | BUILD_BUG_ON((__total) > FLEX_ARRAY_NR_BASE_PTRS * \ |
58 | FLEX_ARRAY_ELEMENTS_PER_PART(__element_size)); \ |
59 | } |
60 | |
61 | struct flex_array *flex_array_alloc(int element_size, unsigned int total, |
62 | gfp_t flags); |
63 | int flex_array_prealloc(struct flex_array *fa, unsigned int start, |
64 | unsigned int end, gfp_t flags); |
65 | void flex_array_free(struct flex_array *fa); |
66 | void flex_array_free_parts(struct flex_array *fa); |
67 | int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src, |
68 | gfp_t flags); |
69 | int flex_array_clear(struct flex_array *fa, unsigned int element_nr); |
70 | void *flex_array_get(struct flex_array *fa, unsigned int element_nr); |
71 | int flex_array_shrink(struct flex_array *fa); |
72 | |
73 | #endif /* _FLEX_ARRAY_H */ |
74 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9