[PATCH v3 12/15] block: Catch possible entries missing from cmd_flag_name[]

[John Garry <john.g.garry@oracle.com>]

Add a BUILD_BUG_ON() call to ensure that we are not missing entries in
cmd_flag_name[].

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 block/blk-mq-debugfs.c    | 2 ++
 include/linux/blk_types.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 312e8a40caad..a4accd79c225 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -281,6 +281,8 @@ int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
 	const enum req_op op = req_op(rq);
 	const char *op_str = blk_op_str(op);
 
+	BUILD_BUG_ON(ARRAY_SIZE(cmd_flag_name) != __REQ_NR_BITS);
+
 	seq_printf(m, "%p {.op=", rq);
 	if (strcmp(op_str, "UNKNOWN") == 0)
 		seq_printf(m, "%u", op);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 632edd71f8c6..36ed96133217 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -354,6 +354,7 @@ enum req_op {
 	REQ_OP_LAST		= (__force blk_opf_t)36,
 };
 
+/* Keep cmd_flag_name[] in sync with the definitions below */
 enum req_flag_bits {
 	__REQ_FAILFAST_DEV =	/* no driver retries of device errors */
 		REQ_OP_BITS,
-- 
2.31.1