linux-kernel - Re: [PATCH] m68k: Enable dead code elimination

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Message-ID: <CAMuHMdV6efvaJuqVjnayyCs2KAbJmi52n0afLS=jh=nKN0y9Ng@mail.gmail.com>
Date: Sun, 6 Jul 2025 11:14:43 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Daniel Palmer <daniel@...f.com>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k: Enable dead code elimination

Hi Daniel,

On Wed, 16 Apr 2025 at 13:42, Daniel Palmer <daniel@...f.com> wrote:
> Allow the experimental dead code elimination config to be enabled.
>
> For my 68000 nommu config this frees up a few hundred K of memory
> so seems worth while.
>
> Boot and build tested on nommu and mmu enabled configs.
>
> Before:
> Memory: 5388K/8192K available (1986K kernel code, 114K rwdata,
> 244K rodata, 92K init, 41K bss, 2624K reserved, 0K cma-reserved)
>
> After
> Memory: 5684K/8192K available (1714K kernel code, 112K rwdata,
> 228K rodata, 92K init, 37K bss, 2328K reserved, 0K cma-reserved)
>
> Signed-off-by: Daniel Palmer <daniel@...f.com>

Thanks for your patch!

Note that enabling this requires enabling CONFIG_EXPERT first, which is
currently enabled in the Coldfire defconfigs, but not in the Classic
defconfigs.  For atari_defconfig, I see a size reduction of ca. 150 KiB
(gcc 13.3.0).

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
i.e. will queue in the m68k tree for v6.17.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds