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    Subject[PATCH 0/10] x86-32: improve atomic64_t functions
    This patchset improves the atomic64_t functions on x86-32.
    It also includes a testsuite that has been used to test this functionality
    and can test any atomic64_t implementation.

    It offers the following improvements:
    1. Better code due to hand-written assembly (e.g. use of the ZF flag)
    2. All atomic64 functions implemented, efficiently
    3. Support for 386/486 due to the ability to alternatively use either
    the cmpxchg8b based implementation or the generic implementation
    4. Use of SSE, if available, for atomic64_read and atomic64_set

    The first patches add functionality to the alternatives system to support
    the new atomic64_t code.
    A patch that improves cmpxchg64() using that functionality is also included.

    To test this code, enable CONFIG_ATOMIC64_SELFTEST, compile for 386 and
    boot normally, with "clearcpuid=25" and with "clearcpuid=8 clearcpuid=25".

    You should receive a message stating that the atomic64 test passed,
    along with the selected configuration.

    Signed-off-by: Luca Barbieri <>

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      Last update: 2010-02-17 12:47    [W:0.020 / U:10.604 seconds]
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