hugetlb: simplify migrate_huge_page()

[pandora-kernel.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index be26d5c..fdce3a2 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -932,15 +932,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
        if (anon_vma)
                put_anon_vma(anon_vma);
        unlock_page(hpage);
-
 out:
-       if (rc != -EAGAIN) {
-               list_del(&hpage->lru);
-               put_page(hpage);
-       }
-
        put_page(new_hpage);
-
        if (result) {
                if (rc)
                        *result = rc;
@@ -1016,48 +1009,32 @@ out:
        return nr_failed + retry;
 }
 
-int migrate_huge_pages(struct list_head *from,
-               new_page_t get_new_page, unsigned long private, bool offlining,
-               enum migrate_mode mode)
+int migrate_huge_page(struct page *hpage, new_page_t get_new_page,
+                     unsigned long private, bool offlining,
+                     enum migrate_mode mode)
 {
-       int retry = 1;
-       int nr_failed = 0;
-       int pass = 0;
-       struct page *page;
-       struct page *page2;
-       int rc;
-
-       for (pass = 0; pass < 10 && retry; pass++) {
-               retry = 0;
-
-               list_for_each_entry_safe(page, page2, from, lru) {
+       int pass, rc;
+
+       for (pass = 0; pass < 10; pass++) {
+               rc = unmap_and_move_huge_page(get_new_page,
+                                             private, hpage, pass > 2, offlining,
+                                             mode);
+               switch (rc) {
+               case -ENOMEM:
+                       goto out;
+               case -EAGAIN:
+                       /* try again */
                        cond_resched();
-
-                       rc = unmap_and_move_huge_page(get_new_page,
-                                       private, page, pass > 2, offlining,
-                                       mode);
-
-                       switch(rc) {
-                       case -ENOMEM:
-                               goto out;
-                       case -EAGAIN:
-                               retry++;
-                               break;
-                       case 0:
-                               break;
-                       default:
-                               /* Permanent failure */
-                               nr_failed++;
-                               break;
-                       }
+                       break;
+               case 0:
+                       goto out;
+               default:
+                       rc = -EIO;
+                       goto out;
                }
        }
-       rc = 0;
 out:
-       if (rc)
-               return rc;
-
-       return nr_failed + retry;
+       return rc;
 }
 
 #ifdef CONFIG_NUMA