From: Theodore Ts'o <tytso@mit.edu>
Date: Sun, 22 Sep 2013 19:24:02 +0000 (-0400)
Subject: random: speed up the fast_mix function by a factor of four
X-Git-Tag: v3.13-rc1~61^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=655b226470b229552ad95b21323864df9bd9fc74;p=pandora-kernel.git

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: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Jörn Engel <joern@logfs.org>
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