> +static inline void
> +ckrm_clear_page_class(struct page *page)
> +{
> + struct ckrm_zone *czone = page_ckrmzone(page);
> + if (czone == NULL)
> + return;
> + sub_use_count(czone->memcls, 0, page_zonenum(page), 1);
> + kref_put(&czone->memcls->nr_users, memclass_release);
> + set_page_ckrmzone(page, NULL);
> }
are you sure if it's safe?
this function is called with zone->lock held,
and memclass_release calls kfree.
YAMAMOTO Takashi
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