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Message-Id: <1222987442.13453.89.camel@calx>
Date: Thu, 02 Oct 2008 17:44:02 -0500
From: Matt Mackall <mpm@...enic.com>
To: David Howells <dhowells@...hat.com>
Cc: Hugh Dickins <hugh@...itas.com>, Nick Piggin <npiggin@...e.de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: unify shmem and tiny-shmem
On Thu, 2008-10-02 at 23:23 +0100, David Howells wrote:
> Hugh Dickins <hugh@...itas.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.
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