[RFC 0/3] Basic support for LWP

[Hans Rosenfeld <hans.rosenfeld@amd.com>]

LWP (Light-Weight Profiling) is a new profiling mechanism that allows
user mode processes to gather performance data about themselves with
very low overhead. The specification can be found here:
        http://developer.amd.com/cpu/LWP/Pages/default.aspx

These patches are against tip/master 531548b311024e1bec01bc412f5258e243a796b7.

This code adds basic support for LWP to the context switch code, which
is the minimum needed to use LWP. Support for other LWP features like
interrupts will be added later.


Hans Rosenfeld (3):
  Cleanup xsave/xrstor support.
  Allow saving of individual states in fpu_xsave().
  Save/restore LWP state in context switches.

 arch/x86/include/asm/i387.h       |   20 +++------
 arch/x86/include/asm/lwp.h        |   68 ++++++++++++++++++++++++++++
 arch/x86/include/asm/msr-index.h  |    1 +
 arch/x86/include/asm/processor.h  |   12 +++++
 arch/x86/include/asm/sigcontext.h |   12 +++++
 arch/x86/include/asm/xsave.h      |   90 +++++++++++++++---------------------
 arch/x86/kernel/process_32.c      |   13 +++++
 arch/x86/kernel/process_64.c      |   13 +++++
 arch/x86/kernel/traps.c           |    2 +-
 arch/x86/kernel/xsave.c           |    6 +-
 10 files changed, 167 insertions(+), 70 deletions(-)
 create mode 100644 arch/x86/include/asm/lwp.h