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>

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>
Nikanth Karthikesan · Jens Axboe
1 parent c69d48540c
Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff
block/blk-core.c
@@ -2097,6 +2097,9 @@
  
 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");
...	...	@@ -2097,6 +2097,9 @@
2097	2097
2098	2098	int __init blk_dev_init(void)
2099	2099	{
	2100	+ BUILD_BUG_ON(__REQ_NR_BITS > 8 *
	2101	+ sizeof(((struct request *)0)->cmd_flags));
	2102	+
2100	2103	kblockd_workqueue = create_workqueue("kblockd");
2101	2104	if (!kblockd_workqueue)
2102	2105	panic("Failed to create kblockd\n");