# Re: \[PATCH v4\] mm: introduce reference pages

- From: Peter Collingbourne \<hidden\>
- Date: 2021-07-17 02:58:51 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/07/6509891
- Thread: https://ratatoskr.run/linux-arm-kernel/2021/06/6508943/t.md

```text
On Mon, Jun 28, 2021 at 6:11 AM Matthew Wilcox [ref] wrote:
>
> On Sat, Jun 19, 2021 at 02:20:02AM -0700, Peter Collingbourne wrote:
> > +++ b/include/linux/mm.h
> > @@ -32,6 +32,7 @@
> >  #include <linux/sched.h>
> >  #include <linux/pgtable.h>
> >  #include <linux/kasan.h>
> > +#include <linux/fs.h>
>
> No.

This was because is_refpage_vma needed to access vm_file->f_op to
check whether the mapping is a reference page. In v5 I've moved that
part of the check into mm/refpage.c.

> > +++ b/include/linux/mman.h
> > @@ -2,6 +2,7 @@
> >  #ifndef _LINUX_MMAN_H
> >  #define _LINUX_MMAN_H
> >
> > +#include <linux/fs.h>
>
> No.

Okay, this one was entirely unused; removed.

Peter

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```