* [PATCH v2] dax: Add missing annotation for wait_entry_unlocked()
@ 2020-04-01 15:33 Jules Irenge
2020-04-15 10:42 ` Jan Kara
0 siblings, 1 reply; 2+ messages in thread
From: Jules Irenge @ 2020-04-01 15:33 UTC (permalink / raw)
To: linux-kernel
Cc: Jules Irenge, Matthew Wilcox, Jan Kara, Alexander Viro,
open list:FILESYSTEM DIRECT ACCESS DAX,
open list:FILESYSTEM DIRECT ACCESS DAX
Sparse reports a warning at wait_entry_unlocked()
warning: context imbalance in wait_entry_unlocked() - unexpected unlock
The root cause is the missing annotation at wait_entry_unlocked()
Add the missing __releases(xas->xa->xa_lock) annotation
Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
---
fs/dax.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/dax.c b/fs/dax.c
index 35da144375a0..ee0468af4d81 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -244,6 +244,7 @@ static void *get_unlocked_entry(struct xa_state *xas, unsigned int order)
* After we call xas_unlock_irq(), we cannot touch xas->xa.
*/
static void wait_entry_unlocked(struct xa_state *xas, void *entry)
+ __releases(xas->xa->xa_lock)
{
struct wait_exceptional_entry_queue ewait;
wait_queue_head_t *wq;
--
Change since v2
- gives more accurate lock variable name
2.25.1
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* Re: [PATCH v2] dax: Add missing annotation for wait_entry_unlocked()
2020-04-01 15:33 [PATCH v2] dax: Add missing annotation for wait_entry_unlocked() Jules Irenge
@ 2020-04-15 10:42 ` Jan Kara
0 siblings, 0 replies; 2+ messages in thread
From: Jan Kara @ 2020-04-15 10:42 UTC (permalink / raw)
To: Jules Irenge
Cc: linux-kernel, Matthew Wilcox, Jan Kara, Alexander Viro,
open list:FILESYSTEM DIRECT ACCESS (DAX),
open list:FILESYSTEM DIRECT ACCESS (DAX)
On Wed 01-04-20 16:33:59, Jules Irenge wrote:
> Sparse reports a warning at wait_entry_unlocked()
>
> warning: context imbalance in wait_entry_unlocked() - unexpected unlock
>
> The root cause is the missing annotation at wait_entry_unlocked()
> Add the missing __releases(xas->xa->xa_lock) annotation
>
> Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
The patch looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> fs/dax.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index 35da144375a0..ee0468af4d81 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -244,6 +244,7 @@ static void *get_unlocked_entry(struct xa_state *xas, unsigned int order)
> * After we call xas_unlock_irq(), we cannot touch xas->xa.
> */
> static void wait_entry_unlocked(struct xa_state *xas, void *entry)
> + __releases(xas->xa->xa_lock)
> {
> struct wait_exceptional_entry_queue ewait;
> wait_queue_head_t *wq;
> --
> Change since v2
> - gives more accurate lock variable name
> 2.25.1
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
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