[deliverable/linux.git] / include / linux / once.h

#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 */
Commit	Line	Data
46234253 HFS	1	#ifndef _LINUX_ONCE_H
	2	#define _LINUX_ONCE_H
	3
	4	#include <linux/types.h>
	5	#include <linux/jump_label.h>
	6
	7	bool __get_random_once(void buf, int nbytes, bool done,
	8	struct static_key *once_key);
	9
	10	#define get_random_once(buf, nbytes) \
	11	({ \
	12	bool ___ret = false; \
	13	static bool ___done = false; \
	14	static struct static_key ___once_key = \
	15	STATIC_KEY_INIT_TRUE; \
	16	if (static_key_true(&___once_key)) \
	17	___ret = __get_random_once((buf), \
	18	(nbytes), \
	19	&___done, \
	20	&___once_key); \
	21	___ret; \
	22	})
	23
	24	#endif /* _LINUX_ONCE_H */