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    SubjectRe: [PATCH] (1/4) 2.5.59 fast reader/writer lock for gettimeofday
    Anton Blanchard <anton@samba.org> wrote:
    >
    >
    > > These need to be mb(), not wmb(), if you want the bits in between
    > > to actually happen in between, as with your xtime example. At
    > > present there's nothing stoping xtime from being *read* before
    > > your read from pre_sequence happens.
    >
    > But with frlocks we synchronise writers with a spinlock, so shouldnt it
    > provide that synchronisation?
    >

    Richard is referring to the new fr_write_begin/end code, which doesn't take a
    spinlock because it assumes that writer serialisation has been provided by
    external means.

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