On Fri, 19 Mar 2021 15:42:08 -0700 Mike Kravetz wrote:
> +
> + if (!can_sleep && free_page_may_sleep(h, page)) {
> + /*
> + * Send page freeing to workqueue
> + *
> + * Only call schedule_work() if hpage_freelist is previously
> + * empty. Otherwise, schedule_work() had been called but the
> + * workfn hasn't retrieved the list yet.
> + */
> + if (llist_add((struct llist_node *)&page->mapping,
> + &hpage_freelist))
> + schedule_work(&free_hpage_work);
> + return;
> + }
Queue work on system_unbound_wq instead of system_wq because of blocking work.
