Merge tag 'pr-20150201-x86-entry' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull "x86: Entry cleanups and a bugfix for 3.20" from Andy Lutomirski:

 " This fixes a bug in the RCU code I added in ist_enter.  It also includes
   the sysret stuff discussed here:

     http://lkml.kernel.org/g/cover.1421453410.git.luto%40amacapital.net "

Signed-off-by: Ingo Molnar <mingo@kernel.org>