https://github.com/torvalds/linux
- v6.9-rc7
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- v6.1
- v6.0-rc7
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- v6.0
- v5.9-rc8
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- v5.9
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- v5.6
- v5.5-rc7
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- v5.4-rc8
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- v5.3
- v5.2-rc7
- v5.2-rc6
- v5.2-rc5
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- v5.2-rc2
- v5.2-rc1
- v5.2
- v5.19-rc8
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- v5.19-rc6
- v5.19-rc5
- v5.19-rc4
- v5.19-rc3
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- v5.19-rc1
- v5.19
- v5.18-rc7
- v5.18-rc6
- v5.18-rc5
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- v5.18-rc2
- v5.18-rc1
- v5.18
- v5.17-rc8
- v5.17-rc7
- v5.17-rc6
- v5.17-rc5
- v5.17-rc4
- v5.17-rc3
- v5.17-rc2
- v5.17-rc1
- v5.17
- v5.16-rc8
- v5.16-rc7
- v5.16-rc6
- v5.16-rc5
- v5.16-rc4
- v5.16-rc3
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- v5.16-rc1
- v5.16
- v5.15-rc7
- v5.15-rc6
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- v5.15-rc4
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- v5.15-rc2
- v5.15-rc1
- v5.15
- v5.14-rc7
- v5.14-rc6
- v5.14-rc5
- v5.14-rc4
- v5.14-rc3
- v5.14-rc2
- v5.14-rc1
- v5.14
- v5.13-rc7
- v5.13-rc6
- v5.13-rc5
- v5.13-rc4
- v5.13-rc3
- v5.13-rc2
- v5.13-rc1
- v5.13
- v5.12-rc8
- v5.12-rc7
- v5.12-rc6
- v5.12-rc5
- v5.12-rc4
- v5.12-rc3
- v5.12-rc2
- v5.12-rc1
- v5.12
- v5.11-rc7
- v5.11-rc6
- v5.11-rc5
- v5.11-rc4
- v5.11-rc3
- v5.11-rc2
- v5.11-rc1
- v5.11
- v5.10-rc7
- v5.10-rc6
- v5.10-rc5
- v5.10-rc4
- v5.10-rc3
- v5.10-rc2
- v5.10-rc1
- v5.10
- v5.1-rc7
- v5.1-rc6
- v5.1-rc5
- v5.1-rc4
- v5.1-rc3
- v5.1-rc2
- v5.1-rc1
- v5.1
- v5.0-rc8
- v5.0-rc7
- v5.0-rc6
- v5.0-rc5
- v5.0-rc4
- v5.0-rc3
- v5.0-rc2
- v5.0-rc1
- v5.0
- v4.9-rc8
- v4.9-rc7
- v4.9-rc6
- v4.9-rc5
- v4.9-rc4
- v4.9-rc3
- v4.9-rc2
- v4.9-rc1
- v4.9
- v4.8-rc8
- v4.8-rc7
- v4.8-rc6
- v4.8-rc5
- v4.8-rc4
- v4.8-rc3
- v4.8-rc2
- v4.8-rc1
- v4.8
- v4.7-rc7
- v4.7-rc6
- v4.7-rc5
- v4.7-rc4
- v4.7-rc3
- v4.7-rc2
- v4.7-rc1
- v4.7
- v4.6-rc7
- v4.6-rc6
- v4.6-rc5
- v4.6-rc4
- v4.6-rc3
- v4.6-rc2
- v4.6-rc1
- v4.6
- v4.5-rc7
- v4.5-rc6
- v4.5-rc5
- v4.5-rc4
- v4.5-rc3
- v4.5-rc2
- v4.5-rc1
- v4.5
- v4.4-rc8
- v4.4-rc7
- v4.4-rc6
- v4.4-rc5
- v4.4-rc4
- v4.4-rc3
- v4.4-rc2
- v4.4-rc1
- v4.4
- v4.3-rc7
- v4.3-rc6
- v4.3-rc5
- v4.3-rc4
- v4.3-rc3
- v4.3-rc2
- v4.3-rc1
- v4.3
- v4.20-rc7
- v4.20-rc6
- v4.20-rc5
- v4.20-rc4
- v4.20-rc3
- v4.20-rc2
- v4.20-rc1
- v4.20
- v4.2-rc8
- v4.2-rc7
- v4.2-rc6
- v4.2-rc5
- v4.2-rc4
- v4.2-rc3
- v4.2-rc2
- v4.2-rc1
- v4.2
- v4.19-rc8
- v4.19-rc7
- v4.19-rc6
- v4.19-rc5
- v4.19-rc4
- v4.19-rc3
- v4.19-rc2
- v4.19-rc1
- v4.19
- v4.18-rc8
- v4.18-rc7
- v4.18-rc6
- v4.18-rc5
- v4.18-rc4
- v4.18-rc3
- v4.18-rc2
- v4.18-rc1
- v4.18
- v4.17-rc7
- v4.17-rc6
- v4.17-rc5
- v4.17-rc4
- v4.17-rc3
- v4.17-rc2
- v4.17-rc1
- v4.17
- v4.16-rc7
- v4.16-rc6
- v4.16-rc5
- v4.16-rc4
- v4.16-rc3
- v4.16-rc2
- v4.16-rc1
- v4.16
- v4.15-rc9
- v4.15-rc8
- v4.15-rc7
- v4.15-rc6
- v4.15-rc5
- v4.15-rc4
- v4.15-rc3
- v4.15-rc2
- v4.15-rc1
- v4.15
- v4.14-rc8
- v4.14-rc7
- v4.14-rc6
- v4.14-rc5
- v4.14-rc4
- v4.14-rc3
- v4.14-rc2
- v4.14-rc1
- v4.14
- v4.13-rc7
- v4.13-rc6
- v4.13-rc5
- v4.13-rc4
- v4.13-rc3
- v4.13-rc2
- v4.13-rc1
- v4.13
- v4.12-rc7
- v4.12-rc6
- v4.12-rc5
- v4.12-rc4
- v4.12-rc3
- v4.12-rc2
- v4.12-rc1
- v4.12
- v4.11-rc8
- v4.11-rc7
- v4.11-rc6
- v4.11-rc5
- v4.11-rc4
- v4.11-rc3
- v4.11-rc2
- v4.11-rc1
- v4.11
- v4.10-rc8
- v4.10-rc7
- v4.10-rc6
- v4.10-rc5
- v4.10-rc4
- v4.10-rc3
- v4.10-rc2
- v4.10-rc1
- v4.10
- v4.1-rc8
- v4.1-rc7
- v4.1-rc6
- v4.1-rc5
- v4.1-rc4
- v4.1-rc3
- v4.1-rc2
- v4.1-rc1
- v4.1
- v4.0-rc7
- v4.0-rc6
- v4.0-rc5
- v4.0-rc4
- v4.0-rc3
- v4.0-rc2
- v4.0-rc1
- v4.0
- v3.9-rc8
- v3.9-rc7
- v3.9-rc6
- v3.9-rc5
- v3.9-rc4
- v3.9-rc3
- v3.9-rc2
- v3.9-rc1
- v3.9
- v3.8-rc7
- v3.8-rc6
- v3.8-rc5
- v3.8-rc4
- v3.8-rc3
- v3.8-rc2
- v3.8-rc1
- v3.8
- v3.7-rc8
- v3.7-rc7
- v3.7-rc6
- v3.7-rc5
- v3.7-rc4
- v3.7-rc3
- v3.7-rc2
- v3.7-rc1
- v3.7
- v3.6-rc7
- v3.6-rc6
- v3.6-rc5
- v3.6-rc4
- v3.6-rc3
- v3.6-rc2
- v3.6-rc1
- v3.6
- v3.5-rc7
- v3.5-rc6
- v3.5-rc5
- v3.5-rc4
- v3.5-rc3
- v3.5-rc2
- v3.5-rc1
- v3.5
- v3.4-rc7
- v3.4-rc6
- v3.4-rc5
- v3.4-rc4
- v3.4-rc3
- v3.4-rc2
- v3.4-rc1
- v3.4
- v3.3-rc7
- v3.3-rc6
- v3.3-rc5
- v3.3-rc4
- v3.3-rc3
- v3.3-rc2
- v3.3-rc1
- v3.3
- v3.2-rc7
- v3.2-rc6
- v3.2-rc5
- v3.2-rc4
- v3.2-rc3
- v3.2-rc2
- v3.2-rc1
- v3.2
- v3.19-rc7
- v3.19-rc6
- v3.19-rc5
- v3.19-rc4
- v3.19-rc3
- v3.19-rc2
- v3.19-rc1
- v3.19
- v3.18-rc7
- v3.18-rc6
- v3.18-rc5
- v3.18-rc4
- v3.18-rc3
- v3.18-rc2
- v3.18-rc1
- v3.18
- v3.17-rc7
- v3.17-rc6
- v3.17-rc5
- v3.17-rc4
- v3.17-rc3
- v3.17-rc2
- v3.17-rc1
- v3.17
- v3.16-rc7
- v3.16-rc6
- v3.16-rc5
- v3.16-rc4
- v3.16-rc3
- v3.16-rc2
- v3.16-rc1
- v3.16
- v3.15-rc8
- v3.15-rc7
- v3.15-rc6
- v3.15-rc5
- v3.15-rc4
- v3.15-rc3
- v3.15-rc2
- v3.15-rc1
- v3.15
- v3.14-rc8
- v3.14-rc7
- v3.14-rc6
- v3.14-rc5
- v3.14-rc4
- v3.14-rc3
- v3.14-rc2
- v3.14-rc1
- v3.14
- v3.13-rc8
- v3.13-rc7
- v3.13-rc6
- v3.13-rc5
- v3.13-rc4
- v3.13-rc3
- v3.13-rc2
- v3.13-rc1
- v3.13
- v3.12-rc7
- v3.12-rc6
- v3.12-rc5
- v3.12-rc4
- v3.12-rc3
- v3.12-rc2
- v3.12-rc1
- v3.12
- v3.11-rc7
- v3.11-rc6
- v3.11-rc5
- v3.11-rc4
- v3.11-rc3
- v3.11-rc2
- v3.11-rc1
- v3.11
- v3.10-rc7
- v3.10-rc6
- v3.10-rc5
- v3.10-rc4
- v3.10-rc3
- v3.10-rc2
- v3.10-rc1
- v3.10
- v3.1-rc9
- v3.1-rc8
- v3.1-rc7
- v3.1-rc6
- v3.1-rc5
- v3.1-rc4
- v3.1-rc3
- v3.1-rc2
- v3.1-rc10
- v3.1-rc1
- v3.1
- v3.0-rc7
- v3.0-rc6
- v3.0-rc5
- v3.0-rc4
- v3.0-rc3
- v3.0-rc2
- v3.0-rc1
- v3.0
- v2.6.39-rc7
- v2.6.39-rc6
- v2.6.39-rc5
- v2.6.39-rc4
- v2.6.39-rc3
- v2.6.39-rc2
- v2.6.39-rc1
- v2.6.39
- v2.6.38-rc8
- v2.6.38-rc7
- v2.6.38-rc6
- v2.6.38-rc5
- v2.6.38-rc4
- v2.6.38-rc3
- v2.6.38-rc2
- v2.6.38-rc1
- v2.6.38
- v2.6.37-rc8
- v2.6.37-rc7
- v2.6.37-rc6
- v2.6.37-rc5
- v2.6.37-rc4
- v2.6.37-rc3
- v2.6.37-rc2
- v2.6.37-rc1
- v2.6.37
- v2.6.36-rc8
- v2.6.36-rc7
- v2.6.36-rc6
- v2.6.36-rc5
- v2.6.36-rc4
- v2.6.36-rc3
- v2.6.36-rc2
- v2.6.36-rc1
- v2.6.36
- v2.6.35-rc6
- v2.6.35-rc5
- v2.6.35-rc4
- v2.6.35-rc3
- v2.6.35-rc2
- v2.6.35-rc1
- v2.6.35
- v2.6.34-rc7
- v2.6.34-rc6
- v2.6.34-rc5
- v2.6.34-rc4
- v2.6.34-rc3
- v2.6.34-rc2
- v2.6.34-rc1
- v2.6.34
- v2.6.33-rc8
- v2.6.33-rc7
- v2.6.33-rc6
- v2.6.33-rc5
- v2.6.33-rc4
- v2.6.33-rc3
- v2.6.33-rc2
- v2.6.33-rc1
- v2.6.33
- v2.6.32-rc8
- v2.6.32-rc7
- v2.6.32-rc6
- v2.6.32-rc5
- v2.6.32-rc4
- v2.6.32-rc3
- v2.6.32-rc1
- v2.6.32
- v2.6.31-rc9
- v2.6.31-rc8
- v2.6.31-rc7
- v2.6.31-rc6
- v2.6.31-rc5
- v2.6.31-rc4
- v2.6.31-rc3
- v2.6.31-rc2
- v2.6.31-rc1
- v2.6.31
- v2.6.30-rc8
- v2.6.30-rc7
- v2.6.30-rc6
- v2.6.30-rc5
- v2.6.30-rc4
- v2.6.30-rc3
- v2.6.30-rc2
- v2.6.30-rc1
- v2.6.30
- v2.6.29-rc8
- v2.6.29-rc7
- v2.6.29-rc6
- v2.6.29-rc5
- v2.6.29-rc4
- v2.6.29-rc3
- v2.6.29-rc2
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- v2.6.29
- v2.6.28-rc9
- v2.6.28-rc8
- v2.6.28-rc7
- v2.6.28-rc6
- v2.6.28-rc5
- v2.6.28-rc4
- v2.6.28-rc3
- v2.6.28-rc2
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- v2.6.28
- v2.6.27-rc9
- v2.6.27-rc8
- v2.6.27-rc7
- v2.6.27-rc6
- v2.6.27-rc5
- v2.6.27-rc4
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- v2.6.27
- v2.6.26-rc9
- v2.6.26-rc8
- v2.6.26-rc7
- v2.6.26-rc6
- v2.6.26-rc5
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- v2.6.26
- v2.6.25-rc9
- v2.6.25-rc8
- v2.6.25-rc7
- v2.6.25-rc6
- v2.6.25-rc5
- v2.6.25-rc4
- v2.6.25-rc3
- v2.6.25-rc2
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- v2.6.25
- v2.6.24-rc8
- v2.6.24-rc7
- v2.6.24-rc6
- v2.6.24-rc5
- v2.6.24-rc4
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- v2.6.24
- v2.6.23-rc9
- v2.6.23-rc8
- v2.6.23-rc7
- v2.6.23-rc6
- v2.6.23-rc5
- v2.6.23-rc4
- v2.6.23-rc3
- v2.6.23-rc2
- v2.6.23-rc1
- v2.6.23
- v2.6.22-rc7
- v2.6.22-rc6
- v2.6.22-rc5
- v2.6.22-rc4
- v2.6.22-rc3
- v2.6.22-rc2
- v2.6.22-rc1
- v2.6.22
- v2.6.21-rc7
- v2.6.21-rc6
- v2.6.21-rc5
- v2.6.21-rc4
- v2.6.21-rc3
- v2.6.21-rc2
- v2.6.21-rc1
- v2.6.21
- v2.6.20-rc7
- v2.6.20-rc6
- v2.6.20-rc5
- v2.6.20-rc4
- v2.6.20-rc3
- v2.6.20-rc2
- v2.6.20-rc1
- v2.6.20
- v2.6.19-rc6
- v2.6.19-rc5
- v2.6.19-rc4
- v2.6.19-rc3
- v2.6.19-rc2
- v2.6.19-rc1
- v2.6.19
- v2.6.18-rc7
- v2.6.18-rc6
- v2.6.18-rc5
- v2.6.18-rc4
- v2.6.18-rc3
- v2.6.18-rc2
- v2.6.18-rc1
- v2.6.18
- v2.6.17-rc6
- v2.6.17-rc5
- v2.6.17-rc4
- v2.6.17-rc3
- v2.6.17-rc2
- v2.6.17-rc1
- v2.6.17
- v2.6.16-rc6
- v2.6.16-rc5
- v2.6.16-rc4
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Tip revision: bbf5c979011a099af5dc76498918ed7df445635b authored by Linus Torvalds on 11 October 2020, 21:15:50 UTC
Linux 5.9
Linux 5.9
Tip revision: bbf5c97
prandom.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* include/linux/prandom.h
*
* Include file for the fast pseudo-random 32-bit
* generation.
*/
#ifndef _LINUX_PRANDOM_H
#define _LINUX_PRANDOM_H
#include <linux/types.h>
#include <linux/percpu.h>
u32 prandom_u32(void);
void prandom_bytes(void *buf, size_t nbytes);
void prandom_seed(u32 seed);
void prandom_reseed_late(void);
struct rnd_state {
__u32 s1, s2, s3, s4;
};
DECLARE_PER_CPU(struct rnd_state, net_rand_state);
u32 prandom_u32_state(struct rnd_state *state);
void prandom_bytes_state(struct rnd_state *state, void *buf, size_t nbytes);
void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state);
#define prandom_init_once(pcpu_state) \
DO_ONCE(prandom_seed_full_state, (pcpu_state))
/**
* 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)
*/
static inline u32 prandom_u32_max(u32 ep_ro)
{
return (u32)(((u64) prandom_u32() * ep_ro) >> 32);
}
/*
* Handle minimum values for seeds
*/
static inline u32 __seed(u32 x, u32 m)
{
return (x < m) ? x + m : x;
}
/**
* prandom_seed_state - set seed for prandom_u32_state().
* @state: pointer to state structure to receive the seed.
* @seed: arbitrary 64-bit value to use as a seed.
*/
static inline void prandom_seed_state(struct rnd_state *state, u64 seed)
{
u32 i = (seed >> 32) ^ (seed << 10) ^ seed;
state->s1 = __seed(i, 2U);
state->s2 = __seed(i, 8U);
state->s3 = __seed(i, 16U);
state->s4 = __seed(i, 128U);
}
/* Pseudo random number generator from numerical recipes. */
static inline u32 next_pseudo_random32(u32 seed)
{
return seed * 1664525 + 1013904223;
}
#endif