85 	CRNG_EMPTY = 0, /* Little to no entropy collected */
134  * Returns: 0 if the input pool has been seeded.
145 			return ret > 0 ? 0 : ret;  in wait_for_random_bytes()
147 	return 0;  in wait_for_random_bytes()
160 	int ret = 0;  in execute_with_initialized_rng()
164 		nb->notifier_call(nb, 0, NULL);  in execute_with_initialized_rng()
281 	 * _vdso_rng_data.generation's invalid value is 0, so add one to the  in crng_reseed()
325 	memset(&chacha_state[12], 0, sizeof(u32) * 4);  in crng_fast_key_erasure()
419 		if (unlikely(chacha_state[12] == 0))  in _get_random_bytes()
432  * wait_for_random_bytes() should be called and return 0 at least once
446 	size_t ret = 0, copied;  in get_random_bytes_user()
449 		return 0;  in get_random_bytes_user()
469 		if (unlikely(chacha_state[12] == 0))  in get_random_bytes_user()
477 		BUILD_BUG_ON(PAGE_SIZE % sizeof(block) != 0);  in get_random_bytes_user()
478 		if (ret % PAGE_SIZE == 0) {  in get_random_bytes_user()
495  * should be called and return 0 at least once at any point prior.
539 		batch->position = 0;						\
544 	batch->entropy[batch->position] = 0;					\
571 	 * This function is technically undefined for ceil == 0, and in fact  in DEFINE_BATCHED_ENTROPY()
608 	return 0;  in random_prepare_cpu()
642 	.hash.h = { BLAKE2S_IV0 ^ (0x01010000 | BLAKE2S_HASH_SIZE),
682 	for (i = 0; i < ARRAY_SIZE(block.rdseed);) {  in extract_entropy()
701 	/* next_key = HASHPRF(seed, RDSEED || 0) */  in extract_entropy()
702 	block.counter = 0;  in extract_entropy()
744 		atomic_notifier_call_chain(&random_ready_notifier, 0, NULL);  in _credit_init_bits()
856 	return 0;  in random_pm_notification()
875 	for (i = 0, arch_bits = sizeof(entropy) * 8; i < ARRAY_SIZE(entropy);) {  in random_init_early()
998 	blocking_notifier_call_chain(&vmfork_chain, 0, NULL);  in add_vmfork_randomness()
1034 	.mix = __TIMER_INITIALIZER(mix_interrupt_randomness, 0)
1046 	FASTMIX_PERM(s[0], s[1], s[2], s[3]);  in fast_mix()
1047 	s[0] ^= v1;  in fast_mix()
1049 	FASTMIX_PERM(s[0], s[1], s[2], s[3]);  in fast_mix()
1050 	s[0] ^= v2;  in fast_mix()
1071 	per_cpu_ptr(&irq_randomness, cpu)->count = 0;  in random_online_cpu()
1072 	return 0;  in random_online_cpu()
1102 	fast_pool->count = 0;  in mix_interrupt_randomness()
1187 	if (delta < 0)  in add_timer_randomness()
1189 	if (delta2 < 0)  in add_timer_randomness()
1191 	if (delta3 < 0)  in add_timer_randomness()
1237 	/* First major is 1, so we get >= 0x200 here. */  in add_disk_randomness()
1238 	add_timer_randomness(disk->random, 0x100 + disk_devt(disk));  in add_disk_randomness()
1282 	if (atomic_inc_return(&state->samples) % state->samples_per_bit == 0)  in entropy_timer()
1295 	unsigned int i, num_different = 0;  in try_to_generate_entropy()
1299 	for (i = 0; i < NUM_TRIAL_SAMPLES - 1; ++i) {  in try_to_generate_entropy()
1309 	atomic_set(&stack->samples, 0);  in try_to_generate_entropy()
1310 	timer_setup_on_stack(&stack->timer, entropy_timer, 0);  in try_to_generate_entropy()
1316 		if (!timer_pending(&stack->timer) && try_to_del_timer_sync(&stack->timer) >= 0) {  in try_to_generate_entropy()
1330 			if (unlikely(num_cpus == 0)) {  in try_to_generate_entropy()
1368  * getrandom(2) with flags=0. In earlier versions, however, it had
1426 	ssize_t ret = 0;  in write_pool_user()
1430 		return 0;  in write_pool_user()
1439 		BUILD_BUG_ON(PAGE_SIZE % sizeof(block) != 0);  in write_pool_user()
1440 		if (ret % PAGE_SIZE == 0) {  in write_pool_user()
1468 		if (!ratelimit_disable && maxwarn <= 0)  in urandom_read_iter()
1490 	if (ret != 0)  in random_read_iter()
1505 		return 0;  in random_ioctl()
1511 		if (ent_count < 0)  in random_ioctl()
1514 		return 0;  in random_ioctl()
1524 		if (ent_count < 0)  in random_ioctl()
1532 		if (unlikely(ret < 0))  in random_ioctl()
1538 		return 0;  in random_ioctl()
1545 		return 0;  in random_ioctl()
1552 		return 0;  in random_ioctl()
1658 	return proc_dostring(&fake_table, 0, buf, lenp, ppos);  in proc_do_uuid()
1665 	return write ? 0 : proc_dointvec(table, 0, buf, lenp, ppos);  in proc_do_rointvec()
1717 	return 0;  in random_sysctls_init()