Re: [PATCH] mm: mglru: use pte_table_clamped_end() helper to calculate the end

[Baolin Wang <baolin.wang@linux.alibaba.com>]

On 11/13/26 1:01 PM, Barry Song wrote:
> On Thu, Nov 12, 2026 at 7:13 PM Baolin Wang
> <baolin.wang@linux.alibaba.com> wrote:
>>
>> Use pte_table_clamped_end() to clamp the range to the PTE table and VMA
>> boundaries when batch-checking young flags, making the code more readable.
>>
>> No functional changes intended.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
>> ---
>> Based on mm/core.git for-next branch.
>>
>> Note that this was found while reviewing David's series:
>> https://lore.kernel.org/all/c31cc8a0-c098-4784-a843-f13f51914094@linux.alibaba.com/
>> ---
>>   mm/vmscan.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index 5495d9be90e8..804d4188e7b4 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -4470,7 +4470,7 @@ bool lru_gen_look_around(struct page_vma_mapped_walk *pvmw, unsigned int nr)
>>          walk = current->reclaim_state ? current->reclaim_state->mm_walk : NULL;
>>
>>          start = max(addr & PMD_MASK, vma->vm_start);
>> -       end = min(addr | ~PMD_MASK, vma->vm_end - 1) + 1;
>> +       end = pte_table_clamped_end(addr, vma->vm_end);
> 
> 
> We don't have pte_table_clamped_end() in Andrew's tree yet;
> it's part of David's patch:
> 
> https://lore.kernel.org/all/20261111-pte_table_clamped_end-v1-1-2dbe339c487a@kernel.org/
> 
> So we're not going through Andrew's tree for this patch, right?

Yes. I think David will pick up this follow-up.