linux-kernel - Re: [PATCH v4 19/20] mips: Convert to GENERIC

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Message-ID: <20210409012349.GG3981976@zorba>
Date:   Thu, 8 Apr 2021 18:23:49 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>, will@...nel.org,
        daniel@...pelevich.san-francisco.ca.us, arnd@...nel.org,
        akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        microblaze <monstr@...str.eu>, linux-mips@...r.kernel.org,
        nios2 <ley.foon.tan@...el.com>, openrisc@...ts.librecores.org,
        linux-hexagon@...r.kernel.org, linux-riscv@...ts.infradead.org,
        x86@...nel.org, linux-xtensa@...ux-xtensa.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v4 19/20] mips: Convert to GENERIC_CMDLINE

On Thu, Apr 08, 2021 at 02:04:08PM -0500, Rob Herring wrote:
> On Tue, Apr 06, 2021 at 10:38:36AM -0700, Daniel Walker wrote:
> > On Fri, Apr 02, 2021 at 03:18:21PM +0000, Christophe Leroy wrote:
> > > -config CMDLINE_BOOL
> > > -	bool "Built-in kernel command line"
> > > -	help
> > > -	  For most systems, it is firmware or second stage bootloader that
> > > -	  by default specifies the kernel command line options.  However,
> > > -	  it might be necessary or advantageous to either override the
> > > -	  default kernel command line or add a few extra options to it.
> > > -	  For such cases, this option allows you to hardcode your own
> > > -	  command line options directly into the kernel.  For that, you
> > > -	  should choose 'Y' here, and fill in the extra boot arguments
> > > -	  in CONFIG_CMDLINE.
> > > -
> > > -	  The built-in options will be concatenated to the default command
> > > -	  line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
> > > -	  command line will be ignored and replaced by the built-in string.
> > > -
> > > -	  Most MIPS systems will normally expect 'N' here and rely upon
> > > -	  the command line from the firmware or the second-stage bootloader.
> > > -
> > 
> > 
> > See how you complained that I have CMDLINE_BOOL in my changed, and you think it
> > shouldn't exist.
> > 
> > Yet here mips has it, and you just deleted it with no feature parity in your
> > changes for this.
> 
> AFAICT, CMDLINE_BOOL equates to a non-empty or empty CONFIG_CMDLINE. You 
> seem to need it just because you have CMDLINE_PREPEND and 
> CMDLINE_APPEND. If that's not it, what feature is missing? CMDLINE_BOOL 
> is not a feature, but an implementation detail.

Not true.

It makes it easier to turn it all off inside the Kconfig , so it's for usability
and multiple architecture have it even with just CMDLINE as I was commenting
here.

Daniel