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SubjectRe: [PATCH] Allow lockless traversal of notifier lists
On Mon, Nov 28, 2005 at 09:47:47PM +0530, Dipankar Sarma wrote:
> On Mon, Nov 28, 2005 at 05:05:47PM +0100, Andi Kleen wrote:
> > *
> > * Returns zero on success, or %-ENOENT on failure.
> > */
> > @@ -175,6 +181,7 @@
> >
>
> There should be an smp_read_barrier_depends() here for the first
> dereferencing of the notifier block head, I think.

Why? The one at the top of the block should be enough, shouldn' it?

-Andi


>
> > while(nb)
> > {
> > + smp_read_barrier_depends();
> > ret=nb->notifier_call(nb,val,v);
> > if(ret&NOTIFY_STOP_MASK)
> > {
>
> Thanks
> Dipankar
-
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