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>

diff --git a/block/Kconfig b/block/Kconfig
index 8bf114a..7f659b2 100644 (file)
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -147,6 +147,18 @@ config BLK_WBT_MQ
        Multiqueue currently doesn't have support for IO scheduling,
        enabling this option is recommended.
 
+config BLK_DEBUG_FS
+       bool "Block layer debugging information in debugfs"
+       default y
+       depends on DEBUG_FS
+       ---help---
+       Include block layer debugging information in debugfs. This information
+       is mostly useful for kernel developers, but it doesn't incur any cost
+       at runtime.
+
+       Unless you are building a kernel for a tiny system, you should
+       say Y here.
+
 menu "Partition Types"
 
 source "block/partitions/Kconfig"

diff --git a/block/Makefile b/block/Makefile
index 6cabe6b..317165f 100644 (file)
--- a/block/Makefile
+++ b/block/Makefile
@@ -26,4 +26,4 @@ obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
 obj-$(CONFIG_BLK_MQ_PCI)       += blk-mq-pci.o
 obj-$(CONFIG_BLK_DEV_ZONED)    += blk-zoned.o
 obj-$(CONFIG_BLK_WBT)          += blk-wbt.o
-obj-$(CONFIG_DEBUG_FS)         += blk-mq-debugfs.o
+obj-$(CONFIG_BLK_DEBUG_FS)     += blk-mq-debugfs.o

diff --git a/block/blk-mq.h b/block/blk-mq.h
index 57cdbf6..b52abd6 100644 (file)
--- 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