[PATCH v2] bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n
From: Coly Li <hidden>
Date: 2018-05-17 09:54:00
Also in:
linux-bcache, stable
Subsystem:
bcache (block layer cache), the rest · Maintainers:
Coly Li, Kent Overstreet, Linus Torvalds
Commit 539d39eb2708 ("bcache: fix wrong return value in bch_debug_init()")
returns the return value of debugfs_create_dir() to bcache_init(). When
CONFIG_DEBUG_FS=n, bch_debug_init() always returns 1 and makes
bcache_init() failedi.
This patch makes bch_debug_init() always returns 0 if CONFIG_DEBUG_FS=n,
so bcache can continue to work for the kernels which don't have debugfs
enanbled.
Fixes: Commit 539d39eb2708 ("bcache: fix wrong return value in bch_debug_init()")
Cc: stable@vger.kernel.org
Signed-off-by: Coly Li <redacted>
Reported-by: Massimo B. <redacted>
Reported-by: Kai Krakow <redacted>
Tested-by: Kai Krakow <redacted>
Cc: Kent Overstreet <redacted>
---
drivers/md/bcache/bcache.h | 5 +++++
drivers/md/bcache/debug.c | 8 ++++----
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 3a0cfb237af9..5b3fe87f32ee 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h@@ -994,8 +994,13 @@ void bch_open_buckets_free(struct cache_set *); int bch_cache_allocator_start(struct cache *ca); +#ifdef CONFIG_DEBUG_FS void bch_debug_exit(void); int bch_debug_init(struct kobject *); +#else +static inline void bch_debug_exit(void) {}; +static inline int bch_debug_init(struct kobject *kobj) { return 0; }; +#endif void bch_request_exit(void); int bch_request_init(void);
diff --git a/drivers/md/bcache/debug.c b/drivers/md/bcache/debug.c
index 4e63c6f6c04d..20e5e524e88e 100644
--- a/drivers/md/bcache/debug.c
+++ b/drivers/md/bcache/debug.c@@ -17,8 +17,6 @@ #include <linux/random.h> #include <linux/seq_file.h> -struct dentry *bcache_debug; - #ifdef CONFIG_BCACHE_DEBUG #define for_each_written_bset(b, start, i) \
@@ -151,6 +149,8 @@ void bch_data_verify(struct cached_dev *dc, struct bio *bio) /* XXX: cache set refcounting */ +struct dentry *bcache_debug; + struct dump_iterator { char buf[PAGE_SIZE]; size_t bytes;
@@ -240,8 +240,6 @@ void bch_debug_init_cache_set(struct cache_set *c) } } -#endif - void bch_debug_exit(void) { if (!IS_ERR_OR_NULL(bcache_debug))
@@ -254,3 +252,5 @@ int __init bch_debug_init(struct kobject *kobj) return IS_ERR_OR_NULL(bcache_debug); } + +#endif
--
2.16.3