blk-mq: fix debugfs compilation issues

This fixes a couple of problems:

1. In the !CONFIG_DEBUG_FS case, the stub definitions were bogus.
2. In the !CONFIG_BLOCK case, blk-mq-debugfs.c shouldn't be compiled at
   all.

Fix the stub definitions and add a CONFIG_BLK_DEBUG_FS Kconfig option.

Fixes: 07e4fead45e6 ("blk-mq: create debugfs directory tree")
Signed-off-by: Omar Sandoval <osandov@fb.com>

Augment Kconfig description.

Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/block/blk-mq.h b/block/blk-mq.h
index 57cdbf6c0cee..b52abd62b1b0 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -84,7 +84,7 @@ extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
 /*
  * debugfs helpers
  */
-#ifdef CONFIG_DEBUG_FS
+#ifdef CONFIG_BLK_DEBUG_FS
 void blk_mq_debugfs_init(void);
 int blk_mq_debugfs_register(struct request_queue *q, const char *name);
 void blk_mq_debugfs_unregister(struct request_queue *q);
@@ -95,21 +95,22 @@ static inline void blk_mq_debugfs_init(void)
 {
 }
 
-int blk_mq_debugfs_register(struct request_queue *q, const char *name);
+static inline int blk_mq_debugfs_register(struct request_queue *q,
+                                          const char *name)
 {
         return 0;
 }
 
-void blk_mq_debugfs_unregister(struct request_queue *q)
+static inline void blk_mq_debugfs_unregister(struct request_queue *q)
 {
 }
 
-int blk_mq_debugfs_register_hctxs(struct request_queue *q)
+static inline int blk_mq_debugfs_register_hctxs(struct request_queue *q)
 {
         return 0;
 }
 
-void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
+static inline void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
 {
 }
 #endif