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    Subject[PATCH 00/17] x86, mpx updates for 4.2 (take 5)
    From
    Date
    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 4 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. Support 32-bit binaries to run on 64-bit kernels

    I've hesitated sending this in the past few weeks as
    the FPU code had a lot of churn and affected our
    ability to test on current kernels. It seems to have
    settled down and appears more stable now.

    As mentioned in the tsk_get_xsave_addr() patches, this must
    be applied after Oleg's fixes which currently ends with:

    commit 7fc253e27 ("x86/fpu: Kill eager_fpu_init_bp()")

    This also 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 4.0-rc4 in git:

    git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-v20

    Dave Hansen (17):
    x86, fpu: wrap get_xsave_addr() to make it safer
    x86, mpx: use new tsk_get_xsave_addr()
    x86, mpx: trace #BR exceptions
    x86, mpx: trace entry to bounds exception paths
    x86, mpx: trace ranged MPX operations
    x86, mpx: trace allocation of new bounds tables
    x86, mpx: boot-time disable
    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 32-bit binaries on 64-bit kernel
    x86, mpx: allow mixed binaries again
    x86, mpx: cleanup: do not pass task around when unnecessary

    Documentation/kernel-parameters.txt | 4 +
    arch/x86/include/asm/mmu_context.h | 13 ++
    arch/x86/include/asm/mpx.h | 76 +++++-----
    arch/x86/include/asm/page_types.h | 8 +
    arch/x86/include/asm/processor.h | 12 +-
    arch/x86/include/asm/trace/mpx.h | 121 +++++++++++++++
    arch/x86/include/asm/xsave.h | 1 +
    arch/x86/kernel/cpu/common.c | 16 ++
    arch/x86/kernel/traps.c | 13 +-
    arch/x86/kernel/uprobes.c | 10 +-
    arch/x86/kernel/xsave.c | 32 ++++
    arch/x86/mm/mpx.c | 283 ++++++++++++++++++++++++++++--------
    kernel/sys.c | 8 +-
    13 files changed, 473 insertions(+), 124 deletions(-)
    create mode 100644 arch/x86/include/asm/trace/mpx.h



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