[RFC][PATCH 0/8] x86, mpx: Support 32-bit binaries on 64-bit kernels

[Dave Hansen]

This is 3.20 material.  I'm hoping to get some comments early
in case folks have some issues with the way it's being done.

--

The MPX hardware structures differ in layout in 32 and 64-bit
mode.  A 32-bit binary running on a 64-bit kernel needs the
32-bit structures, so we need code which switches between
the two modes.

The first patch is just a documentation update.  The next 5
patches are really just prepwork.  The meat is in the last 3.

	x86: make is_64bit_mm() widely available
	x86: make __VIRTUAL_MASK safe to use on 32 bit
	x86, mpx: we do not allocate the bounds directory
	x86, mpx: remove redundant MPX_BNDCFG_ADDR_MASK
	x86, mpx: Add temporary variable to reduce masking
	x86, mpx: new directory entry to addr helper
	x86, mpx: do 32-bit-only cmpxchg for 32-bit apps
	x86, mpx: support 32bit binaries on 64bit kernel

 Documentation/x86/intel_mpx.txt    |   12 +++-
 arch/x86/include/asm/mmu_context.h |   13 +++++
 arch/x86/include/asm/mpx.h         |    2 
 arch/x86/include/asm/page_types.h  |    8 +++
 arch/x86/kernel/uprobes.c          |   10 ---
 arch/x86/mm/mpx.c                  |   93 ++++++++++++++++++++++++++++++-------
 6 files changed, 107 insertions(+), 31 deletions(-)

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