On 8 Aug 2024, at 10:57, Zi Yan wrote:

> On 8 Aug 2024, at 10:36, Kefeng Wang wrote:
>
>> On 2024/8/8 22:21, Zi Yan wrote:
>>> On 8 Aug 2024, at 10:14, David Hildenbrand wrote:
>>>
>>>> On 08.08.24 16:13, Zi Yan wrote:
>>>>> On 8 Aug 2024, at 4:22, David Hildenbrand wrote:
>>>>>
>>>>>> On 08.08.24 05:19, Baolin Wang wrote:
>>>>>>>
>>>>>>>
>> ...
>>>>>> Agreed, maybe we should simply handle that right away and replace the "goto out;" users by "return 0;".
>>>>>>
>>>>>> Then, just copy the 3 LOC.
>>>>>>
>>>>>> For mm/memory.c that would be:
>>>>>>
>>>>>> diff --git a/mm/memory.c b/mm/memory.c
>>>>>> index 67496dc5064f..410ba50ca746 100644
>>>>>> --- a/mm/memory.c
>>>>>> +++ b/mm/memory.c
>>>>>> @@ -5461,7 +5461,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>>>>>>            if (unlikely(!pte_same(old_pte, vmf->orig_pte))) {
>>>>>>                   pte_unmap_unlock(vmf->pte, vmf->ptl);
>>>>>> -               goto out;
>>>>>> +               return 0;
>>>>>>           }
>>>>>>            pte = pte_modify(old_pte, vma->vm_page_prot);
>>>>>> @@ -5528,15 +5528,14 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>>>>>>                   vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
>>>>>>                                                  vmf->address, &vmf->ptl);
>>>>>>                   if (unlikely(!vmf->pte))
>>>>>> -                       goto out;
>>>>>> +                       return 0;
>>>>>>                   if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) {
>>>>>>                           pte_unmap_unlock(vmf->pte, vmf->ptl);
>>>>>> -                       goto out;
>>>>>> +                       return 0;
>>>>>>                   }
>>>>>>                   goto out_map;
>>>>>>           }
>>>>>>    -out:
>>>>>>           if (nid != NUMA_NO_NODE)
>>>>>>                   task_numa_fault(last_cpupid, nid, nr_pages, flags);
>>>>>>           return 0;
>>
>> Maybe drop this part too,
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 410ba50ca746..07343c1469e0 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -5523,6 +5523,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>>         if (!migrate_misplaced_folio(folio, vma, target_nid)) {
>>                 nid = target_nid;
>>                 flags |= TNF_MIGRATED;
>> +               goto out;
>>         } else {
>>                 flags |= TNF_MIGRATE_FAIL;
>>                 vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
>> @@ -5533,12 +5534,8 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>>                         pte_unmap_unlock(vmf->pte, vmf->ptl);
>>                         return 0;
>>                 }
>> -               goto out_map;
>>         }
>>
>> -       if (nid != NUMA_NO_NODE)
>> -               task_numa_fault(last_cpupid, nid, nr_pages, flags);
>> -       return 0;
>>  out_map:
>>         /*
>>          * Make it present again, depending on how arch implements
>> @@ -5551,6 +5548,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>>                 numa_rebuild_single_mapping(vmf, vma, vmf->address, vmf->pte,
>>                                             writable);
>>         pte_unmap_unlock(vmf->pte, vmf->ptl);
>> +out:
>>         if (nid != NUMA_NO_NODE)
>>                 task_numa_fault(last_cpupid, nid, nr_pages, flags);
>>         return 0;
>
> Even better. Thanks. The updated fixup is attached.
Update the fixup, if Andrew wants to fold it in instead of a resend, again to fix a typo causing compilation failure.

Best Regards,
Yan, Zi