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    SubjectRe: [PATCH v4 3/3] qspinlock, x86: Add x86 specific optimization for 2 contending tasks
    On 02/21/2014 12:08 PM, Waiman Long wrote:
    > On 02/21/2014 07:12 AM, Peter Zijlstra wrote:
    >>
    >> Why is this x86 only code?
    >
    > The code is making use of the fact that byte write is atomic which is
    > true in x86 and probably in a few other architectures. I could pull
    > these codes into the generic qspinlock.c file and set a flag in the
    > asm header file to activate it if it is what you want.
    >
    > -Longman

    BTW, I also assume that 8-bit and 16-bit cmpxchg() and xchg() are available.

    -Longman


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