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    SubjectRe: [RFC PATCH 05/35] Add sync bitops
    On Tue, 9 May 2006, Chris Wright wrote:

    > Add "always lock'd" implementations of set_bit, clear_bit and
    > change_bit and the corresponding test_and_ functions. Also add
    > "always lock'd" implementation of cmpxchg. These give guaranteed
    > strong synchronisation and are required for non-SMP kernels running on
    > an SMP hypervisor.

    Could you explain why this is done and what is exactly meant with "always
    looked"? Wh the performance impact?
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