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From:   Hanasaki Jiji <hanasaki@gmail.com>
Date:   Wed, 22 Feb 2023 19:21:34 -0500
Message-ID: <CAMr-kF0rCQZ6OQkb5g5pAzWddFKDv4CGYLFzDQs=hYLjJMsuQw@mail.gmail.com>
Subject: Re: .config and "make" / turning off all debug
To:     LIST - Linux Kernel <linux-kernel@vger.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>
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Hello,

Thank you so much for helping out.

Might the below accomplish the task?

cat f | grep -v DEBUG| grep -v TRACE | grep -v TRACING > newConfigFileWithout

On Tue, Feb 21, 2023 at 7:17 PM Randy Dunlap <rdunlap@infradead.org> wrote:
>
> Hi--
>
> On 2/21/23 08:16, Hanasaki Jiji wrote:
> > Is there a command line parameter to Make that will disable anything
> > that results in a debuggable kernel?
>
> No.
>
> > Is there a tool that will modify .config removing anything that will
> > result in a debuggable kernel?
>
> We don't have a nice, clean, packaged way to do this.
>
> It also depends on what you mean by DEBUG. I would first disable
> CONFIG_COMPILE_TEST, then decide if you want TRACE/TRACING features
> disabled or enabled.  Also decide whether you want DEBUGFS
> options enabled or disabled.
>
> There are a couple of things that you can try. YMMV.
>
> Neither of these is a complete solution; option 2 requires
> the user to update the list of config options that should be disabled
> as needed.
>
> (1) Use a script to convert all occurrences of
> /CONFIG.*DEBUG=y/ to /# CONFIG.*DEBUG is not set/.
>
> This misses a few CONFIG options where "DEBUG" is toward the middle
> of the CONFIG option, like CONFIG_DEBUG_RSEQ, CONFIG_DEBUG_TEST_DRIVER_REMOVE,
> CONFIG_C710_DEBUG_ASSUMPTIONS, CONFIG_DM_DEBUG_BLOCK_MANAGER_LOCKING,
> CONFIG_DRM_DEBUG_xyzzz (a few like this), CONFIG_DEBUG_KERNEL_DC,
> CONFIG_NOUVEAU_DEBUG_xyzzz (a few), CONFIG_DRM_I915_DEBUG_xyzzz (a few),
> CONFIG_SND_SOC_SOF_xyzzz (several), CONFIG_HFI1_DEBUG_SDMA_ORDER,
> CONFIG_AFS_DEBUG_CURSOR, CONFIG_DEBUG_NET, lots of entries in the
> Kernel Hacking menu. Then there are several SELFTEST config options,
> but they are not always spelled "SELFTEST"; they might just be spelled
> TEST or TESTS.
>
> I'll attach a Perl script (from 2009) that begins the work on option 1,
> but I haven't used it since forever.
>
> (2) Make a "mini.config" file that contains a list of all the options that you
> want to have set in a certain way (can be either enabled or disabled).
> Then use
> $ KCONFIG_ALLCONFIG=your.mini.config make allmodconfig
>
> This is the documented and supported way. It is documented in
> Documentation/kbuild/kconfig.rst:
>
> <begin quote>
>
> KCONFIG_ALLCONFIG
> -----------------
> (partially based on lkml email from/by Rob Landley, re: miniconfig)
>
> --------------------------------------------------
>
> The allyesconfig/allmodconfig/allnoconfig/randconfig variants can also
> use the environment variable KCONFIG_ALLCONFIG as a flag or a filename
> that contains config symbols that the user requires to be set to a
> specific value.  If KCONFIG_ALLCONFIG is used without a filename where
> KCONFIG_ALLCONFIG == "" or KCONFIG_ALLCONFIG == "1", `make *config`
> checks for a file named "all{yes/mod/no/def/random}.config"
> (corresponding to the `*config` command that was used) for symbol values
> that are to be forced.  If this file is not found, it checks for a
> file named "all.config" to contain forced values.
>
> This enables you to create "miniature" config (miniconfig) or custom
> config files containing just the config symbols that you are interested
> in.  Then the kernel config system generates the full .config file,
> including symbols of your miniconfig file.
>
> This 'KCONFIG_ALLCONFIG' file is a config file which contains
> (usually a subset of all) preset config symbols.  These variable
> settings are still subject to normal dependency checks.
>
> Examples::
>
>         KCONFIG_ALLCONFIG=custom-notebook.config make allnoconfig
>
> or::
>
>         KCONFIG_ALLCONFIG=mini.config make allnoconfig
>
> or::
>
>         make KCONFIG_ALLCONFIG=mini.config allnoconfig
>
> These examples will disable most options (allnoconfig) but enable or
> disable the options that are explicitly listed in the specified
> mini-config files.
>
> <end quote>
>
> Note that this only works with "make allyesconfig/allmodconfig/allnoconfig/randconfig"
> variants.  You could try it and see if it works for you.
>
> I'll also attach a sample "disable.all.debug.config" file for this option.
> You will need to update this CONFIG options list continually.
>
> HTH. Good luck.
>
> --
> ~Randy