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>
git-mirror · Apr 28, 2009 · 9eb55b0 · 9eb55b0
1 parent c69d485
commit 9eb55b0
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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");