On Mon, Nov 07, 2005 at 12:12:25PM +1100, Nick Piggin wrote:
> Andrew Morton wrote:
>
> >>+static inline int get_task_struct_rcu(struct task_struct *t)
> >>+{
> >>+ int oldusage;
> >>+
> >>+ do {
> >>+ oldusage = atomic_read(&t->usage);
> >>+ if (oldusage == 0) {
> >>+ return 0;
> >>+ }
> >>+ } while (cmpxchg(&t->usage.counter,
> >>+ oldusage, oldusage + 1) != oldusage);
> >>+ return 1;
> >>+}
> >
> >
> >arm (at least) does not implement cmpxchg.
> >
>
> Yes, and using atomic_t.counter in generic code is ugly, albeit
> compatible with all current implementations.
>
> >I think Nick is working on patches which implement cmpxchg on all
> >architectures?
>
> Yes, it is basically ready to go.
Would it simplify the rcuref.h code? Or lib/dec_and_lock.c?
Thanx, Paul
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