linux-kernel - Re: [PATCH] treewide: drop CONFIG

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Message-ID: <86e329b1-c8d7-47bf-8be8-3326daf74eb5@infradead.org>
Date:   Wed, 16 Aug 2023 20:15:09 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     20230816055010.31534-1-rdunlap@...radead.org
Cc:     linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Arnd Bergmann <arnd@...db.de>,
        "Jason A . Donenfeld" <Jason@...c4.com>, wireguard@...ts.zx2c4.com,
        linux-arch@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        Vineet Gupta <vgupta@...nel.org>,
        Brian Cain <bcain@...cinc.com>, linux-hexagon@...r.kernel.org,
        Greg Ungerer <gerg@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org, Michal Simek <monstr@...str.eu>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        linux-openrisc@...r.kernel.org, linux-mips@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org, Max Filippov <jcmvbkbc@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] treewide: drop CONFIG_EMBEDDED

Hi Jesse,

On 8/16/23 15:45, Jesse Taube wrote:
> Hi, Randy
> 
>> diff -- a/init/Kconfig b/init/Kconfig
>> --- a/init/Kconfig
>> +++ b/init/Kconfig
>> @@ -1790,14 +1790,6 @@ config DEBUG_RSEQ
>>
>>        If unsure, say N.
>>
>> -config EMBEDDED
>> -    bool "Embedded system"
>> -    select EXPERT
>> -    help
>> -      This option should be enabled if compiling the kernel for
>> -      an embedded system so certain expert options are available
>> -      for configuration.
> 
> Wouldn't removing this break many out of tree configs?

I'm not familiar with out-of-tree configs.
Do you have some examples of some that use CONFIG_EMBEDDED?
(not distros)

> Should there be a warning here to update change it instead of removal?

kconfig doesn't have a warning mechanism AFAIK.
Do you have an idea of how this would work?

We could make a smaller change to init/Kconfig, like so:

 config EMBEDDED
-	bool "Embedded system"
+	bool "Embedded system (DEPRECATED)"
 	select EXPERT
 	help
-	  This option should be enabled if compiling the kernel for
-	  an embedded system so certain expert options are available
-	  for configuration.
+	  This option is being removed after Linux 6.6.
+	  Use EXPERT instead of EMBEDDED.

but there is no way to produce a warning message. I.e., even with this
change, the message will probably be overlooked.

---
~Randy