[PATCH] mm.h: Fix "mm: Add temporary vma iterator versions of vma_merge(), split_vma(), and __split_vma()

[Liam Howlett]

* Andrew Morton <akpm at linux-foundation.org> [230109 18:15]:
> On Mon, 9 Jan 2023 20:53:22 +0000 Liam Howlett <liam.howlett at oracle.com> wrote:
> 
> > The extern definition of __split_vma() was removed too early.  Re-add it
> > and remove it once the users are all converted.
> 
> I think I sorted this out.
> 
> __split_vma() can be made static to mmap.c?

Ah, I don't think so?  SeongJae reported an issue that I caused by
dropping this definition from the header before mm/madvise.c was updated
to use the alternative.  I think it needs to be in the header and so it
should just probably be there until the function is dropped entirely
later in the series.