[GIT PULL] x86/asm changes for 3.20

[Andy Lutomirski]

Hi Ingo and Thomas,

Please consider pulling for x86/asm.  The sysret stuff hasn't been in
-next, but it's been floating around for a while, and got a reasonably
favorable reception.

If you think it's too late for the sysret stuff for 3.20, then please
pull just "x86, traps: Fix ist_enter from userspace" instead.  It
fixes a regression.

Thanks,
Andy

The following changes since commit 772a9aca12567badb5b9caf2af249a5991f47ea8:

  Merge tag 'pr-20150114-x86-entry' of
git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux into x86/asm
(2015-01-28 15:33:26 +0100)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
tags/pr-20150201-x86-entry

for you to fetch changes up to 96b6352c12711d5c0bb7157f49c92580248e8146:

  x86_64, entry: Remove the syscall exit audit and schedule
optimizations (2015-02-01 04:03:02 -0800)

----------------------------------------------------------------
x86: Entry cleanups and a bugfix for 3.20

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

----------------------------------------------------------------
Andy Lutomirski (3):
      x86, traps: Fix ist_enter from userspace
      x86_64, entry: Use sysret to return to userspace when possible
      x86_64, entry: Remove the syscall exit audit and schedule optimizations

 arch/x86/kernel/entry_64.S | 106 +++++++++++++++++++++++++--------------------
 arch/x86/kernel/traps.c    |  25 ++++++++---
 2 files changed, 77 insertions(+), 54 deletions(-)
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