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    Subject[patch 0/3] x86: xsaveopt kernel enabling patches
    AVX Programming Reference (June, 2010 version) located at
    http://software.intel.com/en-us/avx/ refers to the optimized
    extended state save instruction "xsaveopt".

    xsaveopt is similar to xsave and incorporates optimizations specifically
    targeted for speeding up context switch save, like:
    a. if a state is in an INIT state, the instruction may clear the corresponding
    bit in the xheader.bv with out writing the actual state in to the memory.
    b. if the state hasn't been modified since the last xrstor, the instruction
    may not write out the state to the save area.

    Following patches enable the use of xsaveopt for context switch save/restore
    of the extended state.

    Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>



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