RCU: Joe's RCU

Forward port jRCU to linux-3.0.

Thanks goes to Francisco Franco for his help
in testing out this version on the Android
Galaxy Nexus phone.

Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Ezekeel <notezekeel@googlemail.com>
Revert "Linux 3.4 strings backport"

This reverts commit 3cb67ee4ffc0c63ad4d5ee2f4d98420c9831ac46.