From: Hongfu Li <lihongfu@kylinos.cn>

The !CONFIG_SWAP stub for swap_cluster_lock() has mismatched prototype:
it has an extra unused irq argument and uses pgoff_t instead of unsigned
long for offset. All callers are under CONFIG_SWAP so the extra parameter
is dead.

Sync the stub signature with the real function.

Fixes: 8578e0c00dcf ("mm, swap: use the swap table for the swap cache and switch API")
Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
---
 mm/swap.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swap.h b/mm/swap.h
index 77d2d14eda42..2c4667662601 100644
--- a/mm/swap.h
+++ b/mm/swap.h
@@ -337,7 +337,7 @@ static inline unsigned int folio_swap_flags(struct folio *folio)
 #else /* CONFIG_SWAP */
 struct swap_iocb;
 static inline struct swap_cluster_info *swap_cluster_lock(
-	struct swap_info_struct *si, pgoff_t offset, bool irq)
+		struct swap_info_struct *si, unsigned long offset)
 {
 	return NULL;
 }
-- 
2.54.0

On Thu, Jul 16, 2026 at 4:56 PM Hongfu Li <hongfu.li@linux.dev> wrote:
>
> From: Hongfu Li <lihongfu@kylinos.cn>
>
> The !CONFIG_SWAP stub for swap_cluster_lock() has mismatched prototype:
> it has an extra unused irq argument and uses pgoff_t instead of unsigned
> long for offset. All callers are under CONFIG_SWAP so the extra parameter
> is dead.
>
> Sync the stub signature with the real function.
>
> Fixes: 8578e0c00dcf ("mm, swap: use the swap table for the swap cache and switch API")
> Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
> ---
>  mm/swap.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/swap.h b/mm/swap.h
> index 77d2d14eda42..2c4667662601 100644
> --- a/mm/swap.h
> +++ b/mm/swap.h
> @@ -337,7 +337,7 @@ static inline unsigned int folio_swap_flags(struct folio *folio)
>  #else /* CONFIG_SWAP */
>  struct swap_iocb;
>  static inline struct swap_cluster_info *swap_cluster_lock(
> -       struct swap_info_struct *si, pgoff_t offset, bool irq)
> +               struct swap_info_struct *si, unsigned long offset)

Thanks, nice catch. I didn't see any build failure report, it seems
swap_cluster_lock is never used with !CONFIG_SWAP? In that case we can
just delete this redundant declaration.

在 2026/7/16 17:47, Kairui Song 写道:
> On Thu, Jul 16, 2026 at 4:56 PM Hongfu Li <hongfu.li@linux.dev> wrote:
>> From: Hongfu Li <lihongfu@kylinos.cn>
>>
>> The !CONFIG_SWAP stub for swap_cluster_lock() has mismatched prototype:
>> it has an extra unused irq argument and uses pgoff_t instead of unsigned
>> long for offset. All callers are under CONFIG_SWAP so the extra parameter
>> is dead.
>>
>> Sync the stub signature with the real function.
>>
>> Fixes: 8578e0c00dcf ("mm, swap: use the swap table for the swap cache and switch API")
>> Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
>> ---
>>   mm/swap.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/swap.h b/mm/swap.h
>> index 77d2d14eda42..2c4667662601 100644
>> --- a/mm/swap.h
>> +++ b/mm/swap.h
>> @@ -337,7 +337,7 @@ static inline unsigned int folio_swap_flags(struct folio *folio)
>>   #else /* CONFIG_SWAP */
>>   struct swap_iocb;
>>   static inline struct swap_cluster_info *swap_cluster_lock(
>> -       struct swap_info_struct *si, pgoff_t offset, bool irq)
>> +               struct swap_info_struct *si, unsigned long offset)
> Thanks, nice catch. I didn't see any build failure report, it seems
> swap_cluster_lock is never used with !CONFIG_SWAP? In that case we can
> just delete this redundant declaration.

Agreed. |swap_cluster_lock| is never referenced under |!CONFIG_SWAP|, so 
this
declaration is redundant. I will drop it in v2.

On 07/16/26 at 04:51pm, Hongfu Li wrote:
> From: Hongfu Li <lihongfu@kylinos.cn>
> 
> The !CONFIG_SWAP stub for swap_cluster_lock() has mismatched prototype:
> it has an extra unused irq argument and uses pgoff_t instead of unsigned
> long for offset. All callers are under CONFIG_SWAP so the extra parameter
> is dead.
> 
> Sync the stub signature with the real function.
> 
> Fixes: 8578e0c00dcf ("mm, swap: use the swap table for the swap cache and switch API")
> Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
> ---
>  mm/swap.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/swap.h b/mm/swap.h
> index 77d2d14eda42..2c4667662601 100644
> --- a/mm/swap.h
> +++ b/mm/swap.h
> @@ -337,7 +337,7 @@ static inline unsigned int folio_swap_flags(struct folio *folio)
>  #else /* CONFIG_SWAP */
>  struct swap_iocb;
>  static inline struct swap_cluster_info *swap_cluster_lock(
> -	struct swap_info_struct *si, pgoff_t offset, bool irq)
> +		struct swap_info_struct *si, unsigned long offset)

Good catch.

Reviewed-by: Baoquan He <baoquan.he@linux.dev>

>  {
>  	return NULL;
>  }
> -- 
> 2.54.0
>