Allocate a page for ps-rx for a given skb and preserve pfmemalloc data
struct page * __skb_alloc_page(gfp_t gfp_mask, struct sk_buff * skb);
gfp_mask
alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX
skb
skb to set pfmemalloc on if __GFP_MEMALLOC is used
Allocate a new page.
NULL is returned if there is no free memory.