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random: add 8-bit and 16-bit batches

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There are numerous places in the kernel that would be sped up by having
smaller batches. Currently those callsites do `get_random_u32() & 0xff`
or similar. Since these are pretty spread out, and will require patches
to multiple different trees, let's get ahead of the curve and lay the
foundation for `get_random_u8()` and `get_random_u16()`, so that it's
then possible to start submitting conversion patches leisurely.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-09-28 18:47:30 +02:00
parent 37608ba315
commit 585cd5fe9f
2 changed files with 4 additions and 0 deletions
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2
drivers/char/random.c
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@ -506,6 +506,8 @@ EXPORT_SYMBOL(get_random_ ##type);
DEFINE_BATCHED_ENTROPY(u64)
DEFINE_BATCHED_ENTROPY(u32)
DEFINE_BATCHED_ENTROPY(u16)
DEFINE_BATCHED_ENTROPY(u8)
#ifdef CONFIG_SMP
/*

2
include/linux/random.h
View File

@ -38,6 +38,8 @@ static inline int unregister_random_vmfork_notifier(struct notifier_block *nb) {
#endif
void get_random_bytes(void *buf, size_t len);
u8 get_random_u8(void);
u16 get_random_u16(void);
u32 get_random_u32(void);
u64 get_random_u64(void);
static inline unsigned int get_random_int(void)