On Thu, Nov 13, 2014 at 05:09:27PM -0500, Tejun Heo wrote:
> +int ptrset_add(void *ptr, struct ptrset *set, gfp_t gfp)
> +{
> + struct ptrset_elem *elem;
> + struct rb_node *parent, **slot;
> +
> + elem = kmalloc(sizeof(*elem), gfp);
> + if (!elem && !in_interrupt()) /* see ptrset_preload() */
> + elem = this_cpu_xchg(ptrset_preload_elem, NULL);
> + if (!elem)
> + return -ENOMEM;
> + elem->ptr = ptr;
> +
> + if (ptrset_find_slot(elem->ptr, set, &slot, &parent)) {
> + kfree(elem);
> + return -EEXIST;
> + }
Maybe allocation *after* ptrset_find_slot() will be better?
This will avoid extra kmalloc/kfree if such ptr already exist (and also
will avoid ENOMEM for such cases).
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