48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
|
#ifndef _FLEX_ARRAY_H
|
||
|
|
#define _FLEX_ARRAY_H
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
|
||
|
|
#define FLEX_ARRAY_PART_SIZE PAGE_SIZE
|
||
|
|
#define FLEX_ARRAY_BASE_SIZE PAGE_SIZE
|
||
|
|
|
||
|
|
struct flex_array_part;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is meant to replace cases where an array-like
|
||
|
|
* structure has gotten too big to fit into kmalloc()
|
||
|
|
* and the developer is getting tempted to use
|
||
|
|
* vmalloc().
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct flex_array {
|
||
|
|
union {
|
||
|
|
struct {
|
||
|
|
int element_size;
|
||
|
|
int total_nr_elements;
|
||
|
|
struct flex_array_part *parts[0];
|
||
|
|
};
|
||
|
|
/*
|
||
|
|
* This little trick makes sure that
|
||
|
|
* sizeof(flex_array) == PAGE_SIZE
|
||
|
|
*/
|
||
|
|
char padding[FLEX_ARRAY_BASE_SIZE];
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
#define FLEX_ARRAY_INIT(size, total) { { {\
|
||
|
|
.element_size = (size), \
|
||
|
|
.total_nr_elements = (total), \
|
||
|
|
} } }
|
||
|
|
|
||
|
|
struct flex_array *flex_array_alloc(int element_size, int total, gfp_t flags);
|
||
|
|
int flex_array_prealloc(struct flex_array *fa, int start, int end, gfp_t flags);
|
||
|
|
void flex_array_free(struct flex_array *fa);
|
||
|
|
void flex_array_free_parts(struct flex_array *fa);
|
||
|
|
int flex_array_put(struct flex_array *fa, int element_nr, void *src,
|
||
|
|
gfp_t flags);
|
||
|
|
void *flex_array_get(struct flex_array *fa, int element_nr);
|
||
|
|
|
||
|
|
#endif /* _FLEX_ARRAY_H */
|