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Date:   Thu, 8 Apr 2021 14:04:08 -0500
From:   Rob Herring <robh@kernel.org>
To:     Daniel Walker <danielwa@cisco.com>
Cc:     Christophe Leroy <christophe.leroy@csgroup.eu>, will@kernel.org,
        daniel@gimpelevich.san-francisco.ca.us, arnd@kernel.org,
        akpm@linux-foundation.org, linux-arch@vger.kernel.org,
        devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        microblaze <monstr@monstr.eu>, linux-mips@vger.kernel.org,
        nios2 <ley.foon.tan@intel.com>, openrisc@lists.librecores.org,
        linux-hexagon@vger.kernel.org, linux-riscv@lists.infradead.org,
        x86@kernel.org, linux-xtensa@linux-xtensa.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        linux-mm@kvack.org
Subject: Re: [PATCH v4 19/20] mips: Convert to GENERIC_CMDLINE
Message-ID: <20210408190408.GA1724284@robh.at.kernel.org>
References: <cover.1617375802.git.christophe.leroy@csgroup.eu>
 <a01b6cdbae01fff77e26f7a5c40ee5260e1952b5.1617375802.git.christophe.leroy@csgroup.eu>
 <20210406173836.GW2469518@zorba>
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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.

Rob