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

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Message-ID: <ZXtieLq1kTs4pIbL@eldamar.lan>
Date: Thu, 14 Dec 2023 21:15:52 +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: Re: make deb-pkg: Does not strip debug symbols when compressing
 modules

Hi,

On Thu, Dec 14, 2023 at 09:10:41PM +0100, Salvatore Bonaccorso wrote:
> 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

and the classical one. Missed to attach the promised attachement. The
used config is now here.

Regards,
Salvatore

Download attachment "test.config.xz" of type "application/x-xz" (55432 bytes)