linux-kernel - make deb-pkg: Does not strip debug symbols when compressing modules

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Date: Thu, 14 Dec 2023 21:10:41 +0100
From: Salvatore Bonaccorso <carnil@...ian.org>
To: Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: make deb-pkg: Does not strip debug symbols when compressing modules

Hi

When using (only tested with XZ compression, but the others should
behave similarly) CONFIG_MODULE_COMPRESS_XZ=y to compress the modules,
it looks that the debug symbols are not striped.

Building with the attached test configuration results in packages:

-rw-r--r-- 1 build build  8.9M Dec 14 20:47 linux-headers-6.7.0-rc5+_6.7.0-rc5-00042-g88035e5694a8-1_amd64.deb
-rw-r--r-- 1 build build   75M Dec 14 20:48 linux-image-6.7.0-rc5+-dbg_6.7.0-rc5-00042-g88035e5694a8-1_amd64.deb
-rw-r--r-- 1 build build 1014M Dec 14 20:47 linux-image-6.7.0-rc5+_6.7.0-rc5-00042-g88035e5694a8-1_amd64.deb
-rw-r--r-- 1 build build  1.3M Dec 14 20:47 linux-libc-dev_6.7.0-rc5-00042-g88035e5694a8-1_amd64.deb

This is odd, the linux-image-6.7.0-rc5+ package has a size of almost
1G and the modules are not stripped.

Switching the values instread to 

CONFIG_MODULE_COMPRESS_NONE=y
# CONFIG_MODULE_COMPRESS_XZ is not set

the packages are again produced correctly:

-rw-r--r-- 1 build build 8.9M Dec 14 20:59 linux-headers-6.7.0-rc5+_6.7.0-rc5-00042-g88035e5694a8-2_amd64.deb
-rw-r--r-- 1 build build 819M Dec 14 21:00 linux-image-6.7.0-rc5+-dbg_6.7.0-rc5-00042-g88035e5694a8-2_amd64.deb
-rw-r--r-- 1 build build  73M Dec 14 20:59 linux-image-6.7.0-rc5+_6.7.0-rc5-00042-g88035e5694a8-2_amd64.deb
-rw-r--r-- 1 build build 1.3M Dec 14 20:59 linux-libc-dev_6.7.0-rc5-00042-g88035e5694a8-2_amd64.deb

Regards,
Salvatore