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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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