mm/ksm.c: use list_for_each_entry_safe

Use list_for_each_entry_safe() instead of list_for_each_safe() to
simplify the code.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/ksm.c b/mm/ksm.c
index b5cd647daa524935f73ae99f6e42743771768eaa..2d162c5625f6a1b2564f2f2a4b1db87702eeaa18 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -740,8 +740,7 @@ static int remove_stable_node(struct stable_node *stable_node)
 
 static int remove_all_stable_nodes(void)
 {
-       struct stable_node *stable_node;
-       struct list_head *this, *next;
+       struct stable_node *stable_node, *next;
        int nid;
        int err = 0;
 
@@ -756,8 +755,7 @@ static int remove_all_stable_nodes(void)
                        cond_resched();
                }
        }
-       list_for_each_safe(this, next, &migrate_nodes) {
-               stable_node = list_entry(this, struct stable_node, list);
+       list_for_each_entry_safe(stable_node, next, &migrate_nodes, list) {
                if (remove_stable_node(stable_node))
                        err = -EBUSY;
                cond_resched();
@@ -1583,13 +1581,11 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
                 * so prune them once before each full scan.
                 */
                if (!ksm_merge_across_nodes) {
-                       struct stable_node *stable_node;
-                       struct list_head *this, *next;
+                       struct stable_node *stable_node, *next;
                        struct page *page;
 
-                       list_for_each_safe(this, next, &migrate_nodes) {
-                               stable_node = list_entry(this,
-                                               struct stable_node, list);
+                       list_for_each_entry_safe(stable_node, next,
+                                                &migrate_nodes, list) {
                                page = get_ksm_page(stable_node, false);
                                if (page)
                                        put_page(page);
@@ -2012,8 +2008,7 @@ static void wait_while_offlining(void)
 static void ksm_check_stable_tree(unsigned long start_pfn,
                                  unsigned long end_pfn)
 {
-       struct stable_node *stable_node;
-       struct list_head *this, *next;
+       struct stable_node *stable_node, *next;
        struct rb_node *node;
        int nid;
 
@@ -2034,8 +2029,7 @@ static void ksm_check_stable_tree(unsigned long start_pfn,
                        cond_resched();
                }
        }
-       list_for_each_safe(this, next, &migrate_nodes) {
-               stable_node = list_entry(this, struct stable_node, list);
+       list_for_each_entry_safe(stable_node, next, &migrate_nodes, list) {
                if (stable_node->kpfn >= start_pfn &&
                    stable_node->kpfn < end_pfn)
                        remove_node_from_stable_tree(stable_node);