linux-kernel - Re: [PATCH 2/3] arm64: configs: unset CMDLINE

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Date:   Tue, 15 Oct 2019 09:38:04 +0100
From:   John Garry <john.garry@...wei.com>
To:     Anders Roxell <anders.roxell@...aro.org>,
        <catalin.marinas@....com>, <will@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        "Guohanjun (Hanjun Guo)" <guohanjun@...wei.com>,
        <linux@...linux.org.uk>
Subject: Re: [PATCH 2/3] arm64: configs: unset CMDLINE_FORCE

On 26/09/2019 20:30, Anders Roxell wrote:
> When building allmodconfig KCONFIG_ALLCONFIG=$(pwd)/arch/arm64/configs/defconfig
> CONFIG_CMDLINE_FORCE gets enabled. Which forces the user to pass the
> full cmdline to CONFIG_CMDLINE="...".
>
> Rework so that we disable CONFIG_CMDLINE_FORCE in the defconfig file so
> we don't have to pass in the CONFIG_CMDLINE="..." when building an
> allmodconfig kernel. Since CONFIG_CMDLINE_FORCE is unset default, so
> when doing 'make savedefconfig' CONFIG_CMDLINE_FORCE will be dropped.
>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>  arch/arm64/configs/defconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 52a32b53b2ed..878f379d8d84 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -854,3 +854,4 @@ CONFIG_MAGIC_SYSRQ=y
>  CONFIG_DEBUG_KERNEL=y
>  # CONFIG_SCHED_DEBUG is not set
>  CONFIG_MEMTEST=y
> +# CONFIG_CMDLINE_FORCE is not set

This was my initial idea for an alternative Kconfig change:

--->8---

According to the comment for CMDLINE, we should at least have the root 
device defined. So if CMDLINE is "", then it can not be defined so 
disallow CMDLINE_FORCE in this scenario.

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 950a56b71ff0..6f3bff2f385e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1580,6 +1580,7 @@ config CMDLINE

  config CMDLINE_FORCE
         bool "Always use the default kernel command string"
+       depends on CMDLINE != ""
         help
           Always use the default kernel command string, even if the boot
           loader passes other arguments to the kernel.

>