Re: [v1 resend 03/12] mm/thp: zone_device awareness in THP handling code

[Balbir Singh <balbirs@nvidia.com>]

On 7/4/25 14:46, Mika Penttilä wrote:
> On 7/4/25 02:35, Balbir Singh wrote:
>>  
>> @@ -2899,20 +2923,25 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
>>  		return __split_huge_zero_page_pmd(vma, haddr, pmd);
>>  	}
>>  
>> -	pmd_migration = is_pmd_migration_entry(*pmd);
>> -	if (unlikely(pmd_migration)) {
>> -		swp_entry_t entry;
>>  
>> +	present = pmd_present(*pmd);
>> +	if (unlikely(!present)) {
>> +		swp_entry = pmd_to_swp_entry(*pmd);
>>  		old_pmd = *pmd;
>> -		entry = pmd_to_swp_entry(old_pmd);
>> -		page = pfn_swap_entry_to_page(entry);
>> -		write = is_writable_migration_entry(entry);
>> +
>> +		folio = pfn_swap_entry_folio(swp_entry);
>> +		VM_BUG_ON(!is_migration_entry(swp_entry) &&
>> +				!is_device_private_entry(swp_entry));
>> +		page = pfn_swap_entry_to_page(swp_entry);
>> +		write = is_writable_migration_entry(swp_entry);
> 
> Shouldn't write include is_writable_device_private_entry() also?
> 
> 

Good point, will fix.

Balbir