linux-kernel - [PATCH] kbuild: Use --strip-unneeded with INSTALL_MOD

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Message-Id: <20250122-strip_unneeded-v1-1-ac29a726cb41@rivosinc.com>
Date: Wed, 22 Jan 2025 19:17:26 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH] kbuild: Use --strip-unneeded with INSTALL_MOD_STRIP

On riscv, kernel modules end up with a significant number of local
symbols. This becomes apparent when compiling modules with debug symbols
enabled. Using amdgpu.ko as an example of a large module, on riscv the
size is 754MB (no stripping), 53MB (--strip-debug), and 21MB
(--strip-unneeded). ON x86, amdgpu.ko is 482MB (no stripping), 21MB
(--strip-debug), and 20MB (--strip-unneeded).

Use --strip-unneeded instead of --strip-debug to strip modules so
decrease the size of the resulting modules. This is particularly
relevant for riscv, but also marginally aids other architectures.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
 scripts/Makefile.modinst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index f97c9926ed31b2b14601ff7773a2ea48b225628b..c22f35f6b9db3cac3923b9e787b219f752570642 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -80,7 +80,7 @@ quiet_cmd_install = INSTALL $@
 ifdef INSTALL_MOD_STRIP

 ifeq ($(INSTALL_MOD_STRIP),1)
-strip-option := --strip-debug
+strip-option := --strip-unneeded
 else
 strip-option := $(INSTALL_MOD_STRIP)
 endif

---
base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
change-id: 20250122-strip_unneeded-cab729310056
-- 
- Charlie