Re: [PATCH] mm/swap: Fix swap_cluster_lock() !CONFIG_SWAP stub signature mismatch

[Hongfu Li <hongfu.li@linux.dev>]

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.