linux-kernel - Re: [PATCH v3 0/7] streamline_config.pl: fix: process configs set to "y"

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Message-ID: <20241017183711.3aea0fda@gandalf.local.home>
Date: Thu, 17 Oct 2024 18:37:11 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: David Hunter <david.hunter.linux@...il.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>, linux-kbuild@...r.kernel.org,
 linux-kernel@...r.kernel.org, shuah@...nel.org,
 javier.carrasco.cruz@...il.com
Subject: Re: [PATCH v3 0/7] streamline_config.pl: fix: process configs set
 to "y"

On Mon, 14 Oct 2024 10:13:30 -0400
David Hunter <david.hunter.linux@...il.com> wrote:

> An assumption made in this script is that the config options do not need
> to be processed because they will simply be in the new config file. This
> assumption is incorrect.
> 
> Process the config entries set to "y" because those config entries might
> have dependencies set to "m". If a config entry is set to "m" and is not
> loaded directly into the machine, the script will currently turn off
> that config entry; however, if that turned off config entry is a
> dependency for a "y" option. that means the config entry set to "y"
> will also be turned off later when the conf executive file is called.
> 
> Here is a model of the problem (arrows show dependency):
> 
> Original config file
> Config_1 (m) <-- Config_2 (y)
> 
> Config_1 is not loaded in this example, so it is turned off.
> After scripts/kconfig/streamline_config.pl, but before scripts/kconfig/conf
> Config_1 (n) <-- Config_2 (y)
> 
> After  scripts/kconfig/conf
> Config_1 (n) <-- Config_2 (n)
> 
> 
> It should also be noted that any module in the dependency chain will
> also be turned off, even if that module is loaded directly onto the
> computer. Here is an example:
> 
> Original config file
> Config_1 (m) <-- Config_2 (y) <-- Config_3 (m)
> 
> Config_3 will be loaded in this example.
> After scripts/kconfig/streamline_config.pl, but before scripts/kconfig/conf
> Config_1 (n) <-- Config_2 (y) <-- Config_3 (m)
> 
> After scripts/kconfig/conf
> Config_1 (n) <-- Config_2 (n) <-- Config_3 (n)
> 
> 
> I discovered this problem when I ran "make localmodconfig" on a generic
> Ubuntu config file. Many hardware devices were not recognized once the
> kernel was installed and booted. Another way to reproduced the error I
> had is to run "make localmodconfig" twice. The standard error might display
> warnings that certain modules should be selected but no config files are
> turned on that select that module.
> 
> With the changes in this series patch, all modules are loaded properly
> and all of the hardware is loaded when the kernel is installed and
> booted.
> 

So I tried this out and compared it to what it use to do, and it was quite
a big difference! Attached is the diffconfig.

I copied over my special config, ran localmodconfig, saved it, added your
patches, copied over the same config, and then did the diffconfig between
the two results.

There's a lot I know I don't use that was added!

For example:

 BCACHEFS_FS n -> m

Why is that needed?

I can give you the starting config as well as my lsmod. But right now, it's
adding too much that is not needed.

-- Steve

Download attachment "cdiff" of type "application/octet-stream" (56568 bytes)