Make BLK_TAG_ALLOC_x an enum and add a "max" entry.
Also add a BUILD_BUG_ON() call to ensure that we are not missing entries
in hctx_flag_name[].
Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
block/blk-mq-debugfs.c | 1 +
include/linux/blk-mq.h | 10 ++++++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index b9bf4b25b267..91396f205f0d 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -198,6 +198,7 @@ static int hctx_flags_show(void *data, struct seq_file *m)
BUILD_BUG_ON(ARRAY_SIZE(hctx_flag_name) !=
BLK_MQ_F_ALLOC_POLICY_START_BIT);
+ BUILD_BUG_ON(ARRAY_SIZE(alloc_policy_name) != BLK_TAG_ALLOC_MAX);
seq_puts(m, "alloc_policy=");
if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 6a41d5097dd8..454008397e64 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -278,8 +278,14 @@ enum blk_eh_timer_return {
BLK_EH_RESET_TIMER,
};
-#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
-#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
+/* Keep alloc_policy_name[] in sync with the definitions below */
+enum {
+ /* allocate starting from 0 */
+ BLK_TAG_ALLOC_FIFO = 0,
+ /* allocate starting from last allocated tag */
+ BLK_TAG_ALLOC_RR,
+ BLK_TAG_ALLOC_MAX
+};
/**
* struct blk_mq_hw_ctx - State for a hardware queue facing the hardware
--
2.31.1
