linux-kernel - Re: [PATCH] ARM: multi_v7_defconfig: Enable debugging symbols by default

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <40412179-9bc2-409b-ab12-11149a3e4f5f@app.fastmail.com>
Date: Sat, 07 Sep 2024 12:03:48 +0000
From: "Arnd Bergmann" <arnd@...db.de>
To: "Florian Fainelli" <florian.fainelli@...adcom.com>,
 linux-arm-kernel@...ts.infradead.org
Cc: "Russell King" <linux@...linux.org.uk>,
 "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
 "Marek Szyprowski" <m.szyprowski@...sung.com>,
 "Geert Uytterhoeven" <geert+renesas@...der.be>, "Andrew Davis" <afd@...com>,
 "Jason Gunthorpe" <jgg@...pe.ca>, "Mark Brown" <broonie@...nel.org>,
 "Etienne Carriere" <etienne.carriere@...s.st.com>,
 "Trevor Woerner" <twoerner@...il.com>,
 "Javier Carrasco" <javier.carrasco@...fvision.net>,
 "open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: multi_v7_defconfig: Enable debugging symbols by default

On Fri, Sep 6, 2024, at 21:39, Florian Fainelli wrote:
> Similarly to the ARM64 defconfig, enable debugging symbols and rely upon
> the toolchain's default DWARF implementation.
>
> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>

I usually build with debug info disabled when I'm build testing,
but turn it on explicitly when I try to actually debug a problem.

Depending on the configuration, adding debug info can significantly
increase the build time and file size. I've tried to record exact
data here, building the arm defconfig on gcc-14 with and without
debug info, which doesn't seem too bad, especially with the
reduced debug info:

config         vmlinux time    total time   vmlinux size
disabled-gcc9  49s             81s          35MB
reduced-gcc9   55s             98s          148MB
full-gcc9      66s             105s         443MB
disabled-gcc14 55s             90s          34MB
reduced-gcc14  60s             99s          124MB
full-gcc14     68s             115s         349MB

There is still added disk usage for build testing, but
the time overhead seems fine. I'd like to hear what others
think about the tradeoff.

      Arnd