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-rw-r--r--include/linux/skbuff.h11
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);