linux-kernel - [PATCH 1/2] tinyconfig: enable CONFIG_LD_DEAD_CODE_DATA

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Message-ID: <20250526090815.416922-1-masahiroy@kernel.org>
Date: Mon, 26 May 2025 18:07:51 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 1/2] tinyconfig: enable CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

This CONFIG option, if supported by the architecture, helps reduce the
size of vmlinux.

For example, the size of vmlinux with ARCH=arm tinyconfig decreases as
follows:

   text	   data	    bss	    dec	    hex	filename
 631684	 104500	  18176	 754360	  b82b8	vmlinux.before
 455316	  93404	  15472	 564192	  89be0	vmlinux.after

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 kernel/configs/tiny.config | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/configs/tiny.config b/kernel/configs/tiny.config
index b753695c5a8f..5dd0f0a34a73 100644
--- a/kernel/configs/tiny.config
+++ b/kernel/configs/tiny.config
@@ -2,3 +2,4 @@ CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 CONFIG_KERNEL_XZ=y
 CONFIG_SLUB=y
 CONFIG_SLUB_TINY=y
+CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y
-- 
2.43.0