Use netmem put API, put_netmem(), instead of put_page() in
page_pool_return_netmem().

While at it, delete #include <linux/mm.h> since the last put_page() in
page_pool.c has been just removed with this patch.

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
 net/core/page_pool.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 1106d4759fc6..00bd5898a25c 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -20,7 +20,6 @@
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
 #include <linux/page-flags.h>
-#include <linux/mm.h> /* for put_page() */
 #include <linux/poison.h>
 #include <linux/ethtool.h>
 #include <linux/netdevice.h>
@@ -711,7 +710,7 @@ static __always_inline void __page_pool_release_page_dma(struct page_pool *pool,
 /* Disconnects a page (from a page_pool).  API users can have a need
  * to disconnect a page (from a page_pool), to allow it to be used as
  * a regular page (that will eventually be returned to the normal
- * page-allocator via put_page).
+ * page-allocator via put_netmem() and then put_page()).
  */
 static void page_pool_return_netmem(struct page_pool *pool, netmem_ref netmem)
 {
@@ -732,7 +731,7 @@ static void page_pool_return_netmem(struct page_pool *pool, netmem_ref netmem)
 
 	if (put) {
 		page_pool_clear_pp_info(netmem);
-		put_page(netmem_to_page(netmem));
+		put_netmem(netmem);
 	}
 	/* An optimization would be to call __free_pages(page, pool->p.order)
 	 * knowing page is not part of page-cache (thus avoiding a
-- 
2.17.1