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

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Date:   Thu, 3 Oct 2019 09:40:40 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     John Garry <john.garry@...wei.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/3] arm64: configs: unset CPU_BIG_ENDIAN

On Tue, 1 Oct 2019 at 16:04, John Garry <john.garry@...wei.com> wrote:
>
> On 26/09/2019 20:30, Anders Roxell wrote:
> > When building allmodconfig KCONFIG_ALLCONFIG=$(pwd)/arch/arm64/configs/defconfig
> > CONFIG_CPU_BIG_ENDIAN gets enabled. Which tends not to be what most
> > people wants.
>
> Today allmodconfig does not enable CONFIG_ACPI due to BE config, which
> is quite unfortunate, I'd say.

right.

>
> >
> > Rework so that we disable CONFIG_CPU_BIG_ENDIAN in the defcinfig file so
>
> defconfig

thanks.

>
> > it doesn't get enabled when building allmodconfig kernels. When doing a
> > 'make savedefconfig' CONFIG_CPU_BIG_ENDIAN will be dropped.
>
> So without having to pass KCONFIG_ALLCONFIG or do anything else, what
> about a config for CONFIG_CPU_LITTLE_ENDIAN instead? I'm not sure if
> that was omitted for a specific reason.

Oh, I tried to elaborate on the idea in the cover letter, that using
the defconfig
as base and then configure the rest as modules is to get a bootable kernel
that have as many features turned on as possible. That will make it possible
to run as wide a range of testsuites as possible on a single kernel.

Does that make it clearer ?

Cheers,
Anders


>
> Thanks,
> John
>
> >
> > 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 878f379d8d84..c9aa6b9ee996 100644
> > --- a/arch/arm64/configs/defconfig
> > +++ b/arch/arm64/configs/defconfig
> > @@ -855,3 +855,4 @@ CONFIG_DEBUG_KERNEL=y
> >  # CONFIG_SCHED_DEBUG is not set
> >  CONFIG_MEMTEST=y
> >  # CONFIG_CMDLINE_FORCE is not set
> > +# CONFIG_CPU_BIG_ENDIAN is not set
> >
>
>