linux-kernel - Re: [PATCH] mm/mmap: introduce vma_range

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Date: Mon, 22 Jan 2024 15:40:31 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc: Yajun Deng <yajun.deng@...ux.dev>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/mmap: introduce vma_range_init()

On Mon, 22 Jan 2024 17:00:31 -0500 "Liam R. Howlett" <Liam.Howlett@...cle.com> wrote:

> * Yajun Deng <yajun.deng@...ux.dev> [240110 21:15]:
> > There is a lot of code needs to set the range of vma, introduce
> > vma_range_init() to initialize the range of vma.
> > 
> > Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> > ---
> >  include/linux/mm.h |  9 +++++++++
> >  mm/mmap.c          | 29 +++++++----------------------
> >  2 files changed, 16 insertions(+), 22 deletions(-)
> 
> This isn't a whole lot of code, are there others?  We're losing code
> clarity in favour of saving 6 lines?
> 

Oh.  I thought it was a nice cleanup which made things more clear.

> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index f5a97dec5169..abb4534be3cc 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -3516,6 +3516,15 @@ static inline bool range_in_vma(struct vm_area_struct *vma,
> >  	return (vma && vma->vm_start <= start && end <= vma->vm_end);
> >  }
> >  
> > +static inline void vma_range_init(struct vm_area_struct *vma,
> 
> Any reason this can't be in mm/internal.h ?

That would be good.

> vma_range_set(), vma_set_range(), or just vma_range() might be a better
> name?  My thinking is that some of these are actually modifying the vma
> and not just initializing it, right?

I'd vote for vma_set_range().