From: "Jason A. Donenfeld" Jason@zx2c4.com
commit afba0b80b977b2a8f16234f2acd982f82710ba33 upstream.
Since rand_initialize() is run while interrupts are still off and nothing else is running, we don't need to repeatedly take and release the pool spinlock, especially in the RDSEED loop.
Reviewed-by: Eric Biggers ebiggers@google.com Reviewed-by: Dominik Brodowski linux@dominikbrodowski.net Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/char/random.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -973,10 +973,10 @@ int __init rand_initialize(void) rv = random_get_entropy(); arch_init = false; } - mix_pool_bytes(&rv, sizeof(rv)); + _mix_pool_bytes(&rv, sizeof(rv)); } - mix_pool_bytes(&now, sizeof(now)); - mix_pool_bytes(utsname(), sizeof(*(utsname()))); + _mix_pool_bytes(&now, sizeof(now)); + _mix_pool_bytes(utsname(), sizeof(*(utsname())));
extract_entropy(base_crng.key, sizeof(base_crng.key)); ++base_crng.generation;