linux-kernel - Re: [RFC PATCH v2 4/7] mm: move internal core VMA manipulation functions to own file

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Message-ID: <86fa5aa6-151c-45e3-ab8d-a268f7c090f8@lucifer.local>
Date: Wed, 3 Jul 2024 11:22:09 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
        Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [RFC PATCH v2 4/7] mm: move internal core VMA manipulation
 functions to own file

On Tue, Jul 02, 2024 at 01:38:58PM GMT, Liam R. Howlett wrote:
> * Lorenzo Stoakes <lstoakes@...il.com> [240628 10:35]:
> > This patch introduces vma.c and moves internal core VMA manipulation
> > functions to this file from mmap.c.
> >
> > This allows us to isolate VMA functionality in a single place such that we
> > can create userspace testing code that invokes this functionality in an
> > environment where we can implement simple unit tests of core functionality.
> >
> > This patch ensures that core VMA functionality is explicitly marked as such
> > by its presence in mm/vma.h.
> >
> > It also places the header includes required by vma.c in vma_internal.h,
> > which is simply imported by vma.c. This makes the VMA functionality
> > testable, as userland testing code can simply stub out functionality
> > as required.
> >
> > Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
> > ---
> >  include/linux/mm.h |   35 -
> >  mm/Makefile        |    2 +-
> >  mm/internal.h      |  236 +-----
> >  mm/mmap.c          | 1981 +++-----------------------------------------
> >  mm/mmu_notifier.c  |    2 +
> >  mm/vma.c           | 1766 +++++++++++++++++++++++++++++++++++++++
> >  mm/vma.h           |  362 ++++++++
> >  mm/vma_internal.h  |   52 ++
> >  8 files changed, 2293 insertions(+), 2143 deletions(-)
> >  create mode 100644 mm/vma.c
> >  create mode 100644 mm/vma.h
> >  create mode 100644 mm/vma_internal.h
> >
>
> ...
>
> > diff --git a/mm/mmap.c b/mm/mmap.c
> > index d2eebbed87b9..721870f380bf 100644
> > --- a/mm/mmap.c
> > +++ b/mm/mmap.c
> > @@ -57,6 +57,7 @@
> >  #include <trace/events/mmap.h>
> >
> >  #include "internal.h"
> > +#include "vma.h"
>
> This isn't needed as internal.h includes vma.h in this revision.

Ugh yeah thought I caught all of them but clearly not. Will fix!

>
> >
> >  #ifndef arch_mmap_check
> >  #define arch_mmap_check(addr, len, flags)	(0)
>
> ...
>
> Thanks,
> Liam