1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0336f02e3667..b814bb8fd5ab 100644
--- 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);