Re: [PATCH v2 3/3] mm: return -ENOMEM for page-table allocation failure in insert_pages()

["David Hildenbrand (Arm)" <david@kernel.org>]

On 8/5/26 16:42, Avi Weiss wrote:
> populate_to_pmd() returns NULL only when p4d_alloc(), pud_alloc(), or
> pmd_alloc() fails. These are page-table allocation failures, but
> insert_pages() currently reports them as -EFAULT.
> 
> Return -ENOMEM instead, consistent with the subsequent pte_alloc()
> failure and with the single-page insert_page() path, which reports
> failure of the same page-table allocation chain as -ENOMEM.
> 
> Address and range validation failures in vm_insert_pages() continue to
> return -EFAULT. Keep the later -EFAULT return for
> pte_offset_map_lock(), which is not an allocation failure.
> 
> Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
> ---
>  mm/memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index 11bb4fb98761..16093479d341 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -2438,7 +2438,7 @@ static int insert_pages(struct vm_area_struct *vma, unsigned long addr,
>  more:
>  	pmd = populate_to_pmd(mm, addr);
>  	if (!pmd) {
> -		err = -EFAULT;
> +		err = -ENOMEM;
>  		goto out;
>  	}
>  

For this patch:

Acked-by: David Hildenbrand (Arm) <david@kernel.org>

-- 
Cheers,

David