Re: [PATCH 1/6] mm/huge_memory.c: rework the function vma_adjust_trans_huge()

[Miaohe Lin]

Hi:
On 2021/3/14 4:03, Matthew Wilcox wrote:
> On Sat, Mar 13, 2021 at 05:32:19AM -0500, Miaohe Lin wrote:
>> +static inline void try_to_split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address)
>> +{
>> +	if (address & ~HPAGE_PMD_MASK &&
>> +	    range_in_vma(vma, address & HPAGE_PMD_MASK,
>> +			 (address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE))
>> +		split_huge_pmd_address(vma, address, false, NULL);
>> +}
> 
> This isn't "try to split".  This is "split if needed".  I think the
> comments also need to be moved up here.
> 

Make sense. Would do it in v2! Thanks!

> I'm not even sure this is really an improvement.
> .
> 

At least we can eliminate a couple of duplicated lines and use helper range_in_vma() to improve
the readability slightly. Right? :)