#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 */
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由 Hannes Frederic Sowa 提交于
There's no good reason why users outside of networking should not be using this facility, f.e. for initializing their seeds. Therefore, make it accessible from there as get_random_once(). Signed-off-by: NHannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Acked-by: NAlexei Starovoitov <ast@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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