Re: [RFC PATCH 2/6] mm: nommu: use vma_is_anonymous() to check if vmas are anonymous

On Fri, 14 Aug 2026 20:52:42 +0900,
Lorenzo Stoakes (ARM) wrote:
> 
> On Thu, Aug 13, 2026 at 03:33:57PM +0900, Hajime Tazaki wrote:
> > Private file mappings (like those from /dev/zero) can have vma->vm_file
> > set but remain structurally anonymous since they lack vm_ops. Testing
> > vma->vm_file instead of vma_is_anonymous(vma) might cause mremap to
> > return a spurious -EINVAL when userspace attempts to shrink these
> > mappings.
> >
> > This commit fixes this issue by using vma_is_anonymous() instead of
> > testing vma->vm_file to address the case of /dev/zero.
(snip)
> 
> As staged in review on 1/6 you need to squash this somehow.

I see, thanks for point this out.

-- Hajime