tree 5f057613a3e7f9f4d91a2d7efb341ae7a7313f69
parent 1124b21740ae64f853d6d26248b16da6ff9de972
author H. Peter Anvin <hpa@linux.intel.com> 1343442368 -0400
committer chrmhoffmann <chrmhoffmann@gmail.com> 1531943774 +0200

random: mix in architectural randomness in extract_buf()

commit d2e7c96af1e54b507ae2a6a7dd2baf588417a7e5 upstream.

Mix in any architectural randomness in extract_buf() instead of
xfer_secondary_buf().  This allows us to mix in more architectural
randomness, and it also makes xfer_secondary_buf() faster, moving a
tiny bit of additional CPU overhead to process which is extracting the
randomness.

[ Commit description modified by tytso to remove an extended
  advertisement for the RDRAND instruction. ]

Change-Id: Ia0965618a4066a4c2e77db49b7c713d3f7f4a68d
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: DJ Johnston <dj.johnston@intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>