netvm: propagate page->pfmemalloc to skb

[profile/ivi/kernel-adaptation-intel-automotive.git] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0336f02..b814bb8 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1247,6 +1247,17 @@ static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
 {
        skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
+       /*
+        * Propagate page->pfmemalloc to the skb if we can. The problem is
+        * that not all callers have unique ownership of the page. If
+        * pfmemalloc is set, we check the mapping as a mapping implies
+        * page->index is set (index and pfmemalloc share space).
+        * If it's a valid mapping, we cannot use page->pfmemalloc but we
+        * do not lose pfmemalloc information as the pages would not be
+        * allocated using __GFP_MEMALLOC.
+        */
+       if (page->pfmemalloc && !page->mapping)
+               skb->pfmemalloc = true;
        frag->page.p              = page;
        frag->page_offset         = off;
        skb_frag_size_set(frag, size);