f2fs: update comments for explicit memory barrier

[linux-2.6-microblaze.git] / fs / f2fs / segment.c

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index b8c20d2..2940354 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -653,7 +653,11 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino)
 
        llist_add(&cmd.llnode, &fcc->issue_list);
 
-       /* update issue_list before we wake up issue_flush thread */
+       /*
+        * update issue_list before we wake up issue_flush thread, this
+        * smp_mb() pairs with another barrier in ___wait_event(), see
+        * more details in comments of waitqueue_active().
+        */
        smp_mb();
 
        if (waitqueue_active(&fcc->flush_wait_queue))