[PATCH] xfs: Remove unused function

[PATCH] xfs: Remove unused function

[Jiapeng Chong]

The function are defined in the bitmap.c file, but not called
elsewhere, so delete the unused function.

fs/xfs/scrub/bitmap.c:55:1: warning: unused function 'xbitmap_tree_iter_next'.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7137
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 fs/xfs/scrub/bitmap.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/xfs/scrub/bitmap.c b/fs/xfs/scrub/bitmap.c
index e0c89a9a0ca0..ba4b18e40faa 100644
--- a/fs/xfs/scrub/bitmap.c
+++ b/fs/xfs/scrub/bitmap.c
@@ -48,10 +48,6 @@ static inline struct xbitmap_node *
 xbitmap_tree_iter_first(struct rb_root_cached *root, uint64_t start,
 			uint64_t last);
 
-static inline struct xbitmap_node *
-xbitmap_tree_iter_next(struct xbitmap_node *node, uint64_t start,
-		       uint64_t last);
-
 INTERVAL_TREE_DEFINE(struct xbitmap_node, bn_rbnode, uint64_t,
 		__bn_subtree_last, START, LAST, static inline, xbitmap_tree)
 
-- 
2.20.1.7.g153144c

Re: [PATCH] xfs: Remove unused function

[Bill O'Donnell]

On Fri, Nov 03, 2023 at 03:30:40PM +0800, Jiapeng Chong wrote:
> The function are defined in the bitmap.c file, but not called
> elsewhere, so delete the unused function.
> 
> fs/xfs/scrub/bitmap.c:55:1: warning: unused function 'xbitmap_tree_iter_next'.
> 
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7137
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>

Makes sense.
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>


> ---
>  fs/xfs/scrub/bitmap.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/fs/xfs/scrub/bitmap.c b/fs/xfs/scrub/bitmap.c
> index e0c89a9a0ca0..ba4b18e40faa 100644
> --- a/fs/xfs/scrub/bitmap.c
> +++ b/fs/xfs/scrub/bitmap.c
> @@ -48,10 +48,6 @@ static inline struct xbitmap_node *
>  xbitmap_tree_iter_first(struct rb_root_cached *root, uint64_t start,
>  			uint64_t last);
>  
> -static inline struct xbitmap_node *
> -xbitmap_tree_iter_next(struct xbitmap_node *node, uint64_t start,
> -		       uint64_t last);
> -
>  INTERVAL_TREE_DEFINE(struct xbitmap_node, bn_rbnode, uint64_t,
>  		__bn_subtree_last, START, LAST, static inline, xbitmap_tree)
>  
> -- 
> 2.20.1.7.g153144c
> 

Re: [PATCH] xfs: Remove unused function

[Darrick J. Wong]

On Tue, Nov 07, 2023 at 01:26:46PM -0600, Bill O'Donnell wrote:
> On Fri, Nov 03, 2023 at 03:30:40PM +0800, Jiapeng Chong wrote:
> > The function are defined in the bitmap.c file, but not called
> > elsewhere, so delete the unused function.
> > 
> > fs/xfs/scrub/bitmap.c:55:1: warning: unused function 'xbitmap_tree_iter_next'.
> > 
> > Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> > Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7137
> > Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> 
> Makes sense.
> Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>

I disagree -- I added redundant forward declarations here so I wouldn't
have to go digging through the 150LOC definition of INTERVAL_TREE_DEFINE
to figure out what helper functions were actually being defined by the
macro.  They'll trigger compiler errors if the definition of
INTERVAL_TREE_DEFINE ever drifts away from my understanding of it at the
time I wrote the code.

--D

> 
> 
> > ---
> >  fs/xfs/scrub/bitmap.c | 4 ----
> >  1 file changed, 4 deletions(-)
> > 
> > diff --git a/fs/xfs/scrub/bitmap.c b/fs/xfs/scrub/bitmap.c
> > index e0c89a9a0ca0..ba4b18e40faa 100644
> > --- a/fs/xfs/scrub/bitmap.c
> > +++ b/fs/xfs/scrub/bitmap.c
> > @@ -48,10 +48,6 @@ static inline struct xbitmap_node *
> >  xbitmap_tree_iter_first(struct rb_root_cached *root, uint64_t start,
> >  			uint64_t last);
> >  
> > -static inline struct xbitmap_node *
> > -xbitmap_tree_iter_next(struct xbitmap_node *node, uint64_t start,
> > -		       uint64_t last);
> > -
> >  INTERVAL_TREE_DEFINE(struct xbitmap_node, bn_rbnode, uint64_t,
> >  		__bn_subtree_last, START, LAST, static inline, xbitmap_tree)
> >  
> > -- 
> > 2.20.1.7.g153144c
> > 
> 

Re: [PATCH] xfs: Remove unused function

[Eric Sandeen]

On 11/7/23 2:44 PM, Darrick J. Wong wrote:
> On Tue, Nov 07, 2023 at 01:26:46PM -0600, Bill O'Donnell wrote:
>> On Fri, Nov 03, 2023 at 03:30:40PM +0800, Jiapeng Chong wrote:
>>> The function are defined in the bitmap.c file, but not called
>>> elsewhere, so delete the unused function.
>>>
>>> fs/xfs/scrub/bitmap.c:55:1: warning: unused function 'xbitmap_tree_iter_next'.
>>>
>>> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
>>> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7137
>>> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
>>
>> Makes sense.
>> Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
> 
> I disagree -- I added redundant forward declarations here so I wouldn't
> have to go digging through the 150LOC definition of INTERVAL_TREE_DEFINE
> to figure out what helper functions were actually being defined by the
> macro.  They'll trigger compiler errors if the definition of
> INTERVAL_TREE_DEFINE ever drifts away from my understanding of it at the
> time I wrote the code.

And the comment above those declarations say as much, but Jiapeng Chong seems to
be getting a legitimate warning as a result, and AFAICT xbitmap_tree_iter_next
really isn't used in the codebase. Maybe it's worth commenting it out or
#ifdefing it, while leaving it around for reference as you intended?

(I'm sympathetic to the macro-generated function hell, for sure.)

-Eric

> --D
> 
>>
>>
>>> ---
>>>  fs/xfs/scrub/bitmap.c | 4 ----
>>>  1 file changed, 4 deletions(-)
>>>
>>> diff --git a/fs/xfs/scrub/bitmap.c b/fs/xfs/scrub/bitmap.c
>>> index e0c89a9a0ca0..ba4b18e40faa 100644
>>> --- a/fs/xfs/scrub/bitmap.c
>>> +++ b/fs/xfs/scrub/bitmap.c
>>> @@ -48,10 +48,6 @@ static inline struct xbitmap_node *
>>>  xbitmap_tree_iter_first(struct rb_root_cached *root, uint64_t start,
>>>  			uint64_t last);
>>>  
>>> -static inline struct xbitmap_node *
>>> -xbitmap_tree_iter_next(struct xbitmap_node *node, uint64_t start,
>>> -		       uint64_t last);
>>> -
>>>  INTERVAL_TREE_DEFINE(struct xbitmap_node, bn_rbnode, uint64_t,
>>>  		__bn_subtree_last, START, LAST, static inline, xbitmap_tree)
>>>  
>>> -- 
>>> 2.20.1.7.g153144c
>>>
>>
>