Re: [PATCH] mm: unify shmem and tiny-shmem

[Matt Mackall <mpm@selenic.com>]

On Thu, 2008-10-02 at 23:23 +0100, David Howells wrote:
> Hugh Dickins <hugh@veritas.com> wrote:
> 
> > That's much nicer than I'd been imagining, thanks Matt: I've no qualms
> > about the few #ifdefs you're adding to mm/shmem.c, it does seem an
> > outright improvement that you're bringing them together.
> 
> It's not an outright improvement.  shmem.o is still larger than tiny-shmem.o,
> albeit not a lot; however, some embedded people really do count the bytes.

Here the difference comes down to 16 bytes for the "if (size < 0)"
check/branch, which is a worthwhile check.

> > This ifndef is the ugliest part of it: and looking into it, guess
> > what, shmem_get_unmapped_area() hasn't been used since 2.6.20 -
> > that's right, isn't it, David?
> 
> Ummm...  It seems to be.  I think it used to be used by SYSV SHM.  Certainly
> deleting that function causes no link problems.

I've got a patch queued to drop it, will post shortly.

-- 
Mathematics is the supreme nostalgia of our time.