Re: [PATCH v2 4/5] mm: add largest_zero_folio() routine

[David Hildenbrand <david@redhat.com>]

On 15.07.25 16:16, David Hildenbrand wrote:
> On 07.07.25 16:23, Pankaj Raghav (Samsung) wrote:
>> From: Pankaj Raghav <p.raghav@samsung.com>
>>
>> Add largest_zero_folio() routine so that huge_zero_folio can be
>> used without the need to pass any mm struct. This will return ZERO_PAGE
>> folio if CONFIG_STATIC_PMD_ZERO_PAGE is disabled or if we failed to
>> allocate a PMD page from memblock.
>>
>> This routine can also be called even if THP is disabled.
>>
>> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
>> ---
>>    include/linux/mm.h | 28 ++++++++++++++++++++++++++--
>>    1 file changed, 26 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>> index 428fe6d36b3c..d5543cf7b8e9 100644
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -4018,17 +4018,41 @@ static inline bool vma_is_special_huge(const struct vm_area_struct *vma)
>>    
>>    #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
>>    
>> +extern struct folio *huge_zero_folio;
>> +extern unsigned long huge_zero_pfn;
> 
> No need for "extern".

Scratch that, was confused with functions ...

-- 
Cheers,

David / dhildenb