net/xdp: convert put_page() to put_user_page*()

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in fc1d8e7c ("mm:
introduce put_user_page*(), placeholder versions").

Link: http://lkml.kernel.org/r/20190724044537.10458-4-jhubbard@nvidia.comSigned-off-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Cc: Björn Töpel <bjorn.topel@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net/xdp/xdp_umem.c

@@ -206,14 +206,7 @@ static int xdp_umem_map_pages(struct xdp_umem *umem)
 
 static void xdp_umem_unpin_pages(struct xdp_umem *umem)
 {
-	unsigned int i;
-
-	for (i = 0; i < umem->npgs; i++) {
-		struct page *page = umem->pgs[i];
-
-		set_page_dirty_lock(page);
-		put_page(page);
-	}
+	put_user_pages_dirty_lock(umem->pgs, umem->npgs, true);
 
 	kfree(umem->pgs);
 	umem->pgs = NULL;