mm: migration: clarify migrate_pages() comment

Callers of migrate_pages should putback_lru_pages to return pages isolated to LRU or free list. Now comment is rather confusing. It says caller always have to call it. It is more clear to point out that the caller has to call it if migrate_pages's return value isn't zero. Signed-off-by: Minchan Kim <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Andrea Arcangeli <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
hanmiltonxing · Jan 26, 2011 · 28bd657 · 28bd657
1 parent 33a9387
commit 28bd657
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mm/migrate.c b/mm/migrate.c
@@ -888,7 +888,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
  * are movable anymore because to has become empty
  * or no retryable pages exist anymore.
  * Caller should call putback_lru_pages to return pages to the LRU
- * or free list.
+ * or free list only if ret != 0.
  *
  * Return: Number of pages not migrated or error code.
  */