random: entropy tweaks are all the rage nowadays

use nonblocking for all.  Read this web page:
http://lwn.net/Articles/489734/ - WIP

commit d19e78c01870bc32e40862b50881bb30fe046933 1 parent 709ec23
maxl authored a day ago voku committed in 12 hours
Revert "AIO: Don't plug the I/O queue in do_io_submit() Asynchronous I/O latency to a solid-state disk greatly increased between the 2.6.32 and 3.0 kernels. By removing the plug from do_io_submit(), we observed a 34% improvement in the I/O latency."

This reverts commit 02c0bb78da9b7ea261b83a61d0d8a4eec97f0ca2.

Can cause panic