[PATCH] mm/ksm.c: use list_for_each_entry_safe

[Geliang Tang]

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

Signed-off-by: Geliang Tang <geliangt...@163.com>
---
 mm/ksm.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index 5e96753..ca6d2a0 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -726,8 +726,7 @@ 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;
 
@@ -742,8 +741,7 @@ 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();
@@ -1553,13 +1551,11 @@ 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);
@@ -1981,8 +1977,7 @@ 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;
 
@@ -2003,8 +1998,7 @@ 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);
-- 
2.5.0


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