On Wed, 2008-12-17 at 11:55 -0600, Serge E. Hallyn wrote:
> -void free_ipc_ns(struct kref *kref)
> +void put_ipc_ns(struct ipc_namespace *ns)
> {
> - struct ipc_namespace *ns;
> + if (ns && atomic_dec_and_lock(&ns->count, &mq_lock)) {
> + mq_clear_sbinfo(ns);
> + spin_unlock(&mq_lock);
> + mq_put_mnt(ns);
> + free_ipc_ns(ns);
> + }
> +}
OK, I see now why you wanted to remove the kref and add an atomic_t.
That's probably worth a sentence in the patch description.
I know that atomic_dec_and_lock() can be a nice logical thing to do, but
is it necessary here? Basically, is there something that happens under
mq_lock that can re-raise the ns->count?
-- Dave
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