From: Nikanth Karthikesan <knikanth@suse.de>
Date: Mon, 27 Apr 2009 12:53:54 +0000 (+0200)
Subject: block: catch trying to use more bits than request->cmd_flags has
X-Git-Tag: v2.6.31-rc1~389^2~106
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9eb55b030c4b3227334ee4482402096cd1d1a6fe;p=karo-tx-linux.git

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 1e3b97f0ae6e..394c5bd81271 100644
--- 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");