[PATCH 00/19] x86, mpx updates for 4.2 (take 7)

[Dave Hansen <dave@sr71.net>]

Note: this has been lightly tested.  There were no major changes
since the last version, and I ran my normal compile tests, but
this was a bit hurried because I'm about to get on a plane and
will not be reading email for the next week.

Changes from take 7 / v21:
 * Address a bunch of Thomas's review comments.

Changes from take 5 / v20:

 * Fix get_xsave_addr() to consult xstate_bv in anticipation
   of fixes to xsave code.
 * Bug fix for when an VMA being unmapped has neighbors which
   are bounds tables.
 * Rewrite unmapping code.  I didn't do this lightly. It was
   not originally my own code, and I resisted changing it
   because it worked.  But, I started bug chasing and decided
   it was unmaintainable.  The rewrite ended up removing
   about 20% of the unmapping code and made it much simpler.

Changes from take 4 / v19:

 * Do not pass a task_struct around when we are
   really just going to operate on current

Changes from take 3 / v18 (all minor):

 * use DECLARE_EVENT_CLASS()/DEFINE_EVENT() for
   the ranged tracepoints to save 10 lines of code.

Changes from take 2 / v17 (all minor):

 * fix a couple of whitespace borkages caught by checkpatch,
   and a spelling error or two.
 * replace printk with pr_info() for boot disable
 * change trace print format for address intervals
 * fix up variable name in tsk_get_xsave_addr() comment
 * remove tsk_get_xsave_field() GPL export
 * fix up Qiaowei's From:

--

Hi x86 maintainers,

There are a few basic things going on here:
1. Make FPU/xsave code preempt safe and work properly
2. Add trace points to make kernel and app debugging easier
3. Add a boot-time disable for mpx
4. Rewrite the unmapping code.
5. Support 32-bit binaries to run on 64-bit kernels

This sees breakage unless either booted with 'noxsaves'
or if it has Fenghua's set from here applied:

	http://lkml.kernel.org/r/1429678319-61356-1-git-send-email-fenghua.yu@intel.com

This set is also available against 4.1-rc3 in git:

  git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-v22

 Documentation/kernel-parameters.txt |    4 
 arch/x86/include/asm/mmu_context.h  |   13 
 arch/x86/include/asm/mpx.h          |   74 ++---
 arch/x86/include/asm/processor.h    |   12 
 arch/x86/include/asm/trace/mpx.h    |  122 ++++++++
 arch/x86/include/asm/xsave.h        |    1 
 arch/x86/kernel/cpu/common.c        |   16 +
 arch/x86/kernel/traps.c             |   18 -
 arch/x86/kernel/uprobes.c           |   10 
 arch/x86/kernel/xsave.c             |   77 ++++-
 arch/x86/mm/mpx.c                   |  507 ++++++++++++++++++++++--------------
 kernel/sys.c                        |    8 
 12 files changed, 595 insertions(+), 267 deletions(-)