Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
10struct 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
19struct 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#define FLEX_ARRAY_INIT(size, total) { { {\
35 .element_size = (size), \
36 .total_nr_elements = (total), \
37} } }
38
39struct flex_array *flex_array_alloc(int element_size, unsigned int total,
40 gfp_t flags);
41int flex_array_prealloc(struct flex_array *fa, unsigned int start,
42 unsigned int end, gfp_t flags);
43void flex_array_free(struct flex_array *fa);
44void flex_array_free_parts(struct flex_array *fa);
45int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src,
46 gfp_t flags);
47void *flex_array_get(struct flex_array *fa, unsigned int element_nr);
48
49#endif /* _FLEX_ARRAY_H */