Add a build-time assert that we are not missing entries from
hctx_state_name[]. For this, add a "max" entry for BLK_MQ_S_x flags.
Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
block/blk-mq-debugfs.c | 1 +
include/linux/blk-mq.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 9e18ba6b1c4d..fca8b82464b4 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -165,6 +165,7 @@ static int hctx_state_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = data;
+ BUILD_BUG_ON(ARRAY_SIZE(hctx_state_name) != BLK_MQ_S_MAX);
blk_flags_show(m, hctx->state, hctx_state_name,
ARRAY_SIZE(hctx_state_name));
seq_puts(m, "\n");
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 89ba6b16fe8b..225e51698470 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -664,12 +664,14 @@ enum {
BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
BLK_MQ_F_ALLOC_POLICY_BITS = 1,
+ /* Keep hctx_state_name[] in sync with the definitions below */
BLK_MQ_S_STOPPED = 0,
BLK_MQ_S_TAG_ACTIVE = 1,
BLK_MQ_S_SCHED_RESTART = 2,
/* hw queue is inactive after all its CPUs become offline */
BLK_MQ_S_INACTIVE = 3,
+ BLK_MQ_S_MAX,
BLK_MQ_MAX_DEPTH = 10240,
--
2.31.1
