[PATCH net-next] net: Don't return pfmemalloc pages to the page pool.

[Jonathan Lemon]

Return pfmemalloc pages back to the page allocator, instead of holding them
in the page pool.  While here, also use the __page_pool_return_page() API.

Signed-off-by: Jonathan Lemon <jonathan.le...@gmail.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 43a932cb609b..091007ff14a3 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -233,7 +233,7 @@ void __page_pool_put_page(struct page_pool *pool,
         *
         * refcnt == 1 means page_pool owns page, and can recycle it.
         */
-       if (likely(page_ref_count(page) == 1)) {
+       if (likely(page_ref_count(page) == 1 && !page_is_pfmemalloc(page))) {
                /* Read barrier done in page_ref_count / READ_ONCE */
 
                if (allow_direct && in_serving_softirq())
@@ -259,8 +259,7 @@ void __page_pool_put_page(struct page_pool *pool,
         * doing refcnt based recycle tricks, meaning another process
         * will be invoking put_page.
         */
-       __page_pool_clean_page(pool, page);
-       put_page(page);
+       __page_pool_return_page(pool, page);
 }
 EXPORT_SYMBOL(__page_pool_put_page);
 
-- 
2.17.1