tree 176cda3ae729c520bff1b0f6a19806c18c0a7523
parent 47d06e532e95b71c0db3839ebdef3fe8812fca2c
author Theodore Ts'o <tytso@mit.edu> 1379786302 -0400
committer Theodore Ts'o <tytso@mit.edu> 1381429853 -0400

random: allow architectures to optionally define random_get_entropy()

Allow architectures which have a disabled get_cycles() function to
provide a random_get_entropy() function which provides a fine-grained,
rapidly changing counter that can be used by the /dev/random driver.

For example, an architecture might have a rapidly changing register
used to control random TLB cache eviction, or DRAM refresh that
doesn't meet the requirements of get_cycles(), but which is good
enough for the needs of the random driver.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org