random32: add prandom_init_once helper for own rngs
Add a prandom_init_once() facility that works on the rnd_state, so that
users that are keeping their own state independent from prandom_u32() can
initialize their taus113 per cpu states.
The motivation here is similar to net_get_random_once(): initialize the
state as late as possible in the hope that enough entropy has been
collected for the seeding. prandom_init_once() makes use of the recently
introduced prandom_seed_full_state() helper and is generic enough so that
it could also be used on fast-paths due to the DO_ONCE().
Signed-off-by: Daniel Borkmann <firstname.lastname@example.org>
Acked-by: Hannes Frederic Sowa <email@example.com>
Acked-by: Alexei Starovoitov <firstname.lastname@example.org>
Signed-off-by: David S. Miller <email@example.com>
2 files changed