[XFS] use scalable vmap API

[safe/jmp/linux-2.6] / mm / backing-dev.c

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 2a56124..801c08b 100644 (file)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -176,7 +176,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
        int ret = 0;
        struct device *dev;
 
-       if (WARN_ON(bdi->dev))
+       if (bdi->dev)   /* The driver needs to use separate queues per device */
                goto exit;
 
        va_start(args, fmt);