Re: [PATCH v2 08/10] mm/vma: Use unmap_desc in exit_mmap() and vms_clear_ptes()

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 16 Jan 2026 17:07:06 -0800 SeongJae Park <sj@kernel.org> wrote:

> > > Suspect you need to add:
> > > 
> > > #include <linux/pgtable.h>
> > > 
> > > to mm/vma_internal.h.
> > > 
> > > Some arches don't define it and that header has:
> > > 
> > > #ifndef USER_PGTABLES_CEILING
> > > #define USER_PGTABLES_CEILING	0UL
> > > #endif
> > > 
> > > ...
> > > 
> > > #ifndef FIRST_USER_ADDRESS
> > > #define FIRST_USER_ADDRESS	0UL
> > > #endif
> 
> But the macro definitions are enclosed by '#ifdef CONFIG_MMU'.  I have
> !CONFIG_MMU build test, which shows similar errors, even after Lorenzo's
> suggestion is applied.  Should we move the definitions out of the '#ifdef
> CONFIG_MMU', or implement another unmap_all_init() for !CONFIG_MMU case?
> 
> I confirmed a simple version of the first option (moving definitions out of
> CONFIG_MMU, in addition to including pgtable.h) like below works at least for
> my !CONFIG_MMU test.
> 

Worked for me, thanks.  I also unbreaks arm allnoconfig.  I usually run
that but I must have missed this time.

I understand that v3 is in the works.  Meanwhile I'll include your patch to
make mm-new a happier place.