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

[Liam R. Howlett]

* Lorenzo Stoakes <lstoakes@xxxxxxxxx> [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@xxxxxxxxx>
> ---
>  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.

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

...

Thanks,
Liam