25 lines
596 B
C
25 lines
596 B
C
|
#ifndef _LINUX_ONCE_H
|
||
|
|
#define _LINUX_ONCE_H
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/jump_label.h>
|
||
|
|
|
||
|
|
bool __get_random_once(void *buf, int nbytes, bool *done,
|
||
|
|
struct static_key *once_key);
|
||
|
|
|
||
|
|
#define get_random_once(buf, nbytes) \
|
||
|
|
({ \
|
||
|
|
bool ___ret = false; \
|
||
|
|
static bool ___done = false; \
|
||
|
|
static struct static_key ___once_key = \
|
||
|
|
STATIC_KEY_INIT_TRUE; \
|
||
|
|
if (static_key_true(&___once_key)) \
|
||
|
|
___ret = __get_random_once((buf), \
|
||
|
|
(nbytes), \
|
||
|
|
&___done, \
|
||
|
|
&___once_key); \
|
||
|
|
___ret; \
|
||
|
|
})
|
||
|
|
|
||
|
|
#endif /* _LINUX_ONCE_H */
|