random: speed up the fast_mix function by a factor of four
By mixing the entropy in chunks of 32-bit words instead of byte by byte, we can speed up the fast_mix function significantly. Since it is called on every single interrupt, on systems with a very heavy interrupt load, this can make a noticeable difference. Also fix a compilation warning in add_interrupt_randomness() and avoid xor'ing cycles and jiffies together just in case we have an architecture which tries to define random_get_entropy() by returning jiffies. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu> Reported-by: NJörn Engel <joern@logfs.org>
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