[PATCH 1/2] mm/page_ref: use page_ref helper instead of direct modification of _count

[js1304]

From: Joonsoo Kim <iamjoonsoo....@lge.com>

page_reference manipulation functions are introduced to track down
reference count change of the page. Use it instead of direct modification
of _count.

Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 2 +-
 drivers/net/ethernet/qlogic/qede/qede_main.c       | 2 +-
 mm/filemap.c                                       | 2 +-
 net/wireless/util.c                                | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c 
b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index fa05e34..8acd7c0 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -23,7 +23,7 @@ static void nicvf_get_page(struct nicvf *nic)
        if (!nic->rb_pageref || !nic->rb_page)
                return;
 
-       atomic_add(nic->rb_pageref, &nic->rb_page->_count);
+       page_ref_add(nic->rb_page, nic->rb_pageref);
        nic->rb_pageref = 0;
 }
 
diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c 
b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 518af32..394c97ff 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -791,7 +791,7 @@ static inline int qede_realloc_rx_buffer(struct qede_dev 
*edev,
                 * network stack to take the ownership of the page
                 * which can be recycled multiple times by the driver.
                 */
-               atomic_inc(&curr_cons->data->_count);
+               page_ref_inc(curr_cons->data);
                qede_reuse_page(edev, rxq, curr_cons);
        }
 
diff --git a/mm/filemap.c b/mm/filemap.c
index a8c69c8..0ebd326 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -213,7 +213,7 @@ void __delete_from_page_cache(struct page *page, void 
*shadow)
                         * some other bad page check should catch it later.
                         */
                        page_mapcount_reset(page);
-                       atomic_sub(mapcount, &page->_count);
+                       page_ref_sub(page, mapcount);
                }
        }
 
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 9f440a9..e22432a 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -651,7 +651,7 @@ __frame_add_frag(struct sk_buff *skb, struct page *page,
        struct skb_shared_info *sh = skb_shinfo(skb);
        int page_offset;
 
-       atomic_inc(&page->_count);
+       page_ref_inc(page);
        page_offset = ptr - page_address(page);
        skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 }
-- 
1.9.1