block: catch trying to use more bits than request->cmd_flags has

Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/blk-core.c b/block/blk-core.c
index 1e3b97f..394c5bd 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2097,6 +2097,9 @@ EXPORT_SYMBOL(kblockd_schedule_work);
 
 int __init blk_dev_init(void)
 {
+       BUILD_BUG_ON(__REQ_NR_BITS > 8 *
+                       sizeof(((struct request *)0)->cmd_flags));
+
        kblockd_workqueue = create_workqueue("kblockd");
        if (!kblockd_workqueue)
                panic("Failed to create kblockd\n");