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

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Message-ID: <20250416114240.2929832-1-daniel@0x0f.com>
Date: Wed, 16 Apr 2025 20:42:40 +0900
From: Daniel Palmer <daniel@...f.com>
To: geert@...ux-m68k.org,
	linux-m68k@...ts.linux-m68k.org
Cc: linux-kernel@...r.kernel.org,
	Daniel Palmer <daniel@...f.com>
Subject: [PATCH] m68k: Enable dead code elimination

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>
---
 arch/m68k/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index eb5bb6d36899..11835eb59d94 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -32,6 +32,7 @@ config M68K
 	select HAVE_ASM_MODVERSIONS
 	select HAVE_DEBUG_BUGVERBOSE
 	select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_HAS_NO_UNALIGNED
+	select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_UID16
 	select MMU_GATHER_NO_RANGE if MMU
-- 
2.47.2