Re: [PATCH v3 04/10] mm/vmalloc: propagate errors in vmap_pages_p*d_range()

[Hao Ge]

Hi Dev

Thanks for your review.

On 2026/10/30 15:29, Dev Jain wrote:
> 
> 
> On 26/10/26 1:33 pm, Hao Ge wrote:
>> vmap_pages_pmd_range(), vmap_pages_pud_range() and
>> vmap_pages_p4d_range() return -ENOMEM whenever the level below them
>> fails.  But vmap_pages_pte_range() can also return -EINVAL for a
>> page without a valid pfn and -EBUSY for a pte that is already
>> mapped.  Pass the error up as-is instead, like the vmap_p*d_range()
>> helpers for vmap_page_range() do.
>>
>> Signed-off-by: Hao Ge <hao.ge@xxxxxxxxx>
>> ---
> 
> Fixes?
>

Sorry, I missed that.

> Reviewed-by: Dev Jain <dev.jain@xxxxxxx>

Thanks! If you have some time, I'd also appreciate a review of the
remaining patches in the series -- or Suren and Uladzislau, if they
get a chance. No rush, I know everyone is busy.

Thanks
Best Regards
Hao

> 
> 
>>  mm/vmalloc.c | 24 +++++++++++++++---------
>>  1 file changed, 15 insertions(+), 9 deletions(-)
>>
>> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>> index 7131f60d1a8e..d60b99b81ec9 100644
>> --- a/mm/vmalloc.c
>> +++ b/mm/vmalloc.c
>> @@ -600,16 +600,18 @@ static int vmap_pages_pmd_range(pud_t *pud, unsigned long addr,
>>  {
>>  	pmd_t *pmd;
>>  	unsigned long next;
>> +	int err = 0;
>>  
>>  	pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
>>  	if (!pmd)
>>  		return -ENOMEM;
>>  	do {
>>  		next = pmd_addr_end(addr, end);
>> -		if (vmap_pages_pte_range(pmd, addr, next, prot, pages, nr, mask))
>> -			return -ENOMEM;
>> +		err = vmap_pages_pte_range(pmd, addr, next, prot, pages, nr, mask);
>> +		if (err)
>> +			break;
>>  	} while (pmd++, addr = next, addr != end);
>> -	return 0;
>> +	return err;
>>  }
>>  
>>  static int vmap_pages_pud_range(p4d_t *p4d, unsigned long addr,
>> @@ -618,16 +620,18 @@ static int vmap_pages_pud_range(p4d_t *p4d, unsigned long addr,
>>  {
>>  	pud_t *pud;
>>  	unsigned long next;
>> +	int err = 0;
>>  
>>  	pud = pud_alloc_track(&init_mm, p4d, addr, mask);
>>  	if (!pud)
>>  		return -ENOMEM;
>>  	do {
>>  		next = pud_addr_end(addr, end);
>> -		if (vmap_pages_pmd_range(pud, addr, next, prot, pages, nr, mask))
>> -			return -ENOMEM;
>> +		err = vmap_pages_pmd_range(pud, addr, next, prot, pages, nr, mask);
>> +		if (err)
>> +			break;
>>  	} while (pud++, addr = next, addr != end);
>> -	return 0;
>> +	return err;
>>  }
>>  
>>  static int vmap_pages_p4d_range(pgd_t *pgd, unsigned long addr,
>> @@ -636,16 +640,18 @@ static int vmap_pages_p4d_range(pgd_t *pgd, unsigned long addr,
>>  {
>>  	p4d_t *p4d;
>>  	unsigned long next;
>> +	int err = 0;
>>  
>>  	p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
>>  	if (!p4d)
>>  		return -ENOMEM;
>>  	do {
>>  		next = p4d_addr_end(addr, end);
>> -		if (vmap_pages_pud_range(p4d, addr, next, prot, pages, nr, mask))
>> -			return -ENOMEM;
>> +		err = vmap_pages_pud_range(p4d, addr, next, prot, pages, nr, mask);
>> +		if (err)
>> +			break;
>>  	} while (p4d++, addr = next, addr != end);
>> -	return 0;
>> +	return err;
>>  }
>>  
>>  static int vmap_small_pages_range_noflush(unsigned long addr, unsigned long end,
>