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

["Lorenzo Stoakes (ARM)" <ljs@kernel.org>]

mm/memory: please let's be consistent on all of the patches in the series.

On Tue, Aug 25, 2026 at 12:40:36PM +0200, David Hildenbrand (Arm) wrote:
> 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

LGTM too so:

Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>

--
Cheers, Lorenzo