* [PATCH v2] bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n
@ 2018-05-17 9:53 Coly Li
2018-05-17 11:35 ` Kent Overstreet
0 siblings, 1 reply; 3+ messages in thread
From: Coly Li @ 2018-05-17 9:53 UTC (permalink / raw)
To: linux-bcache; +Cc: linux-block, Coly Li, stable, Kent Overstreet
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 <colyli@suse.de>
Reported-by: Massimo B. <massimo.b@gmx.net>
Reported-by: Kai Krakow <kai@kaishome.de>
Tested-by: Kai Krakow <kai@kaishome.de>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH v2] bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n
2018-05-17 9:53 [PATCH v2] bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n Coly Li
@ 2018-05-17 11:35 ` Kent Overstreet
2018-05-17 14:33 ` Coly Li
0 siblings, 1 reply; 3+ messages in thread
From: Kent Overstreet @ 2018-05-17 11:35 UTC (permalink / raw)
To: Coly Li; +Cc: linux-bcache, linux-block, stable
On Thu, May 17, 2018 at 05:53:48PM +0800, Coly Li wrote:
> 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 <colyli@suse.de>
> Reported-by: Massimo B. <massimo.b@gmx.net>
> Reported-by: Kai Krakow <kai@kaishome.de>
> Tested-by: Kai Krakow <kai@kaishome.de>
> Cc: Kent Overstreet <kent.overstreet@gmail.com>
> ---
> 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
you could just use if (IS_ENABLED(CONFIG_DEBUG_FS)) in bch_debug_init, that way
you don't need to add an #ifdef
> 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
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n
2018-05-17 11:35 ` Kent Overstreet
@ 2018-05-17 14:33 ` Coly Li
0 siblings, 0 replies; 3+ messages in thread
From: Coly Li @ 2018-05-17 14:33 UTC (permalink / raw)
To: Kent Overstreet; +Cc: linux-bcache, linux-block, stable
On 2018/5/17 7:35 PM, Kent Overstreet wrote:
> On Thu, May 17, 2018 at 05:53:48PM +0800, Coly Li wrote:
>> 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 <colyli@suse.de>
>> Reported-by: Massimo B. <massimo.b@gmx.net>
>> Reported-by: Kai Krakow <kai@kaishome.de>
>> Tested-by: Kai Krakow <kai@kaishome.de>
>> Cc: Kent Overstreet <kent.overstreet@gmail.com>
>> ---
>> 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
>
> you could just use if (IS_ENABLED(CONFIG_DEBUG_FS)) in bch_debug_init, that way
> you don't need to add an #ifdef
>
Yes, it is much simpler. v3 patch resent for your review.
Thanks for the hint.
Coly Li
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-05-17 9:53 [PATCH v2] bcache: return 0 from bch_debug_init() if CONFIG_DEBUG_FS=n Coly Li
2018-05-17 11:35 ` Kent Overstreet
2018-05-17 14:33 ` Coly Li
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