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#ifndef __BACKPORT_RANDOM_H
#define __BACKPORT_RANDOM_H
#include_next <linux/random.h>
#include <linux/version.h>
#if (LINUX_VERSION_IS_GEQ(3,3,0) && LINUX_VERSION_IS_LESS(3,4,10)) || \
(LINUX_VERSION_IS_GEQ(3,1,0) && LINUX_VERSION_IS_LESS(3,2,27)) || \
LINUX_VERSION_IS_LESS(3,0,41)
#define add_device_randomness LINUX_BACKPORT(add_device_randomness)
static inline void add_device_randomness(const void *buf, unsigned int size)
{
}
#endif
/* #if LINUX_VERSION_IS_LESS(3,8,0) */
/* already backported in our kernels */
#if 0
/* backports 496f2f9 */
#define prandom_seed(_seed) srandom32(_seed)
#define prandom_u32() random32()
#define prandom_u32_state(_state) prandom32(_state)
/* backport 6582c665d6b882dad8329e05749fbcf119f1ab88 */
#define prandom_bytes LINUX_BACKPORT(prandom_bytes)
void prandom_bytes(void *buf, int bytes);
#endif
#if LINUX_VERSION_IS_LESS(3,14,0)
/**
* prandom_u32_max - returns a pseudo-random number in interval [0, ep_ro)
* @ep_ro: right open interval endpoint
*
* Returns a pseudo-random number that is in interval [0, ep_ro). Note
* that the result depends on PRNG being well distributed in [0, ~0U]
* u32 space. Here we use maximally equidistributed combined Tausworthe
* generator, that is, prandom_u32(). This is useful when requesting a
* random index of an array containing ep_ro elements, for example.
*
* Returns: pseudo-random number in interval [0, ep_ro)
*/
#define prandom_u32_max LINUX_BACKPORT(prandom_u32_max)
static inline u32 prandom_u32_max(u32 ep_ro)
{
return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
}
#endif /* LINUX_VERSION_IS_LESS(3,14,0) */
#if LINUX_VERSION_IS_LESS(4,11,0)
static inline u32 get_random_u32(void)
{
return get_random_int();
}
#endif
#endif /* __BACKPORT_RANDOM_H */
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