[PATCH] mm: fix rss and mmlist locking

[linux-2.6-omap-h63xx.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index e9ef599498b5eec6261c201992d54992b9bdcd6d..d68421dd64eff746fbfbc7eeb791224fe17cac35 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -372,7 +372,9 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                        /* make sure dst_mm is on swapoff's mmlist. */
                        if (unlikely(list_empty(&dst_mm->mmlist))) {
                                spin_lock(&mmlist_lock);
-                               list_add(&dst_mm->mmlist, &src_mm->mmlist);
+                               if (list_empty(&dst_mm->mmlist))
+                                       list_add(&dst_mm->mmlist,
+                                                &src_mm->mmlist);
                                spin_unlock(&mmlist_lock);
                        }
                }