On Sat, Apr 26, 2014 at 06:06:15PM +0200, Lionel Debroux wrote:
> Based on PaX.
Lovely - cargo-cult at its finest. "Most refcounts are atomic, must be
good medicine. Shaman has spoken".
> - int refcount;
> + atomic_t refcount;
... therefore, all places that modify that sucker will have to be visible
in the patch. And those are
> - ++item->refcount;
> + atomic_inc(&item->refcount);
> ref->object = item->object;
> mutex_unlock(&item->mutex);
and
> mutex_lock(&item->mutex);
> - BUG_ON(item->refcount == 0);
> + BUG_ON(atomic_read(&item->refcount) == 0);
> BUG_ON(ref->object != item->object);
> - if (--item->refcount == 0) {
> + if (atomic_dec_and_test(&item->refcount)) {
> ref->release(ref);
> item->object = NULL;
Mind explaining how could we manage to reach either without item->mutex
being held, serializing the modifications?
NAK, in case it's not obvious from the above...
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