Re: [PATCH v2 01/33] mm: move vma_start_pgoff() into mm.h and clean up

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

On Wed, Jul 15, 2026 at 02:05:42PM -0400, Liam R. Howlett wrote:
> On 26/07/10 09:16PM, Lorenzo Stoakes wrote:
> > vma_last_pgoff() already lives there, so it's a bit odd to keep
> > vma_start_pgoff() in mm/interval_tree.c. Move them together.
> >
> > These each return unsigned long, which pgoff_t is typedef'd to. Make this
> > consistent and have these functions return pgoff_t instead.
> >
> > Additionally, express vma_last_pgoff() in terms of vma_start_pgoff(), since
> > we wrap the vma->vm_pgoff access, we may as well use it here.
> >
> > Also while we're here, const-ify the VMA and cleanup a bit.
> >
> > Also update the VMA userland tests to reflect the change.
>
> This patch could have been 01/35?  Disappointing, but I will try to get
> over it.

;) well I have a series I've not sent yet that maybe could grow a bit to achieve
 these aims? :>)

>
> >
> > No functional change intended.
> >
> > Reviewed-by: Gregory Price <gourry@gourry.net>
> > Acked-by: David Hildenbrand (Arm) <david@kernel.org>
> > Reviewed-by: Pedro Falcato <pfalcato@suse.de>
> > Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
> > Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
>
> Reviewed-by: Liam R. Howlett (Oracle) <liam@infradead.org>

Thanks!

>
> > ---
> >  include/linux/mm.h              | 9 +++++++--
> >  mm/interval_tree.c              | 5 -----
> >  tools/testing/vma/include/dup.h | 5 +++++
> >  3 files changed, 12 insertions(+), 7 deletions(-)
> >
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index 25e669632d2c..09b06d8fea74 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -4307,9 +4307,14 @@ static inline unsigned long vma_pages(const struct vm_area_struct *vma)
> >  	return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
> >  }
> >
> > -static inline unsigned long vma_last_pgoff(struct vm_area_struct *vma)
> > +static inline pgoff_t vma_start_pgoff(const struct vm_area_struct *vma)
> >  {
> > -	return vma->vm_pgoff + vma_pages(vma) - 1;
> > +	return vma->vm_pgoff;
> > +}
> > +
> > +static inline pgoff_t vma_last_pgoff(const struct vm_area_struct *vma)
> > +{
> > +	return vma_start_pgoff(vma) + vma_pages(vma) - 1;
> >  }
> >
> >  static inline unsigned long vma_desc_size(const struct vm_area_desc *desc)
> > diff --git a/mm/interval_tree.c b/mm/interval_tree.c
> > index 32bcfbfcf15f..344d1f5946c7 100644
> > --- a/mm/interval_tree.c
> > +++ b/mm/interval_tree.c
> > @@ -10,11 +10,6 @@
> >  #include <linux/rmap.h>
> >  #include <linux/interval_tree_generic.h>
> >
> > -static inline unsigned long vma_start_pgoff(struct vm_area_struct *v)
> > -{
> > -	return v->vm_pgoff;
> > -}
> > -
> >  INTERVAL_TREE_DEFINE(struct vm_area_struct, shared.rb,
> >  		     unsigned long, shared.rb_subtree_last,
> >  		     vma_start_pgoff, vma_last_pgoff, /* empty */, vma_interval_tree)
> > diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
> > index bf26b3f48d3a..668650067c7c 100644
> > --- a/tools/testing/vma/include/dup.h
> > +++ b/tools/testing/vma/include/dup.h
> > @@ -1301,6 +1301,11 @@ static inline unsigned long vma_pages(const struct vm_area_struct *vma)
> >  	return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
> >  }
> >
> > +static inline pgoff_t vma_start_pgoff(const struct vm_area_struct *vma)
> > +{
> > +	return vma->vm_pgoff;
> > +}
> > +
> >  static inline int vfs_mmap_prepare(struct file *file, struct vm_area_desc *desc)
> >  {
> >  	return file->f_op->mmap_prepare(desc);
> >
> > --
> > 2.55.0
> >

Cheers, Lorenzo