null_blk: suppress invalid partition info

null_blk is partitionable, but it doesn't store any of the info. When
it is loaded, you would normally see:

[1226739.343608]  nullb0: unknown partition table
[1226739.343746]  nullb1: unknown partition table

which can confuse some people. Add the appropriate gendisk flag
to suppress this info.

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index aa2224a..65cd61a 100644 (file)
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -579,7 +579,7 @@ static int null_add_dev(void)
        sector_div(size, bs);
        set_capacity(disk, size);
 
-       disk->flags |= GENHD_FL_EXT_DEVT;
+       disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
        disk->major             = null_major;
        disk->first_minor       = nullb->index;
        disk->fops              = &null_fops;