linux-kernel - Re: [PATCH 1/1] kconfig: add CPU endian selection beconfig and leconfig

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Message-ID: <5658A368.7080509@gmail.com>
Date:	Fri, 27 Nov 2015 10:39:36 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Scott Branden <sbranden@...adcom.com>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>
Cc:	bcm-kernel-feedback-list@...adcom.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] kconfig: add CPU endian selection beconfig and
 leconfig

Le 26/11/2015 11:59, Scott Branden a écrit :
> Add support for switching defconfig between big and little endian CPU.
> Various CPU types have ability to select big and little endian
> CPU in the kernel configuration.
> 
> "make beconfig" will set CONFIG_CPU_BIG_ENDIAN
> "make leconfig" will unset CONFIG_CPU_BIG_ENDIAN

I believe I understand what you are trying to achieve here, which is to
have an identical defconfig file that you can share between a big-endian
and little-endian kernel?

Is not this something better left to a build system which understands
what config fragments are in general?

Since we seem to have support for fragments now with kvm and friends,
having this does not seem to be a big stretch though.

> 
> Signed-off-by: Scott Branden <sbranden@...adcom.com>
> ---
>  kernel/configs/be.config |  1 +
>  kernel/configs/le.config |  1 +
>  scripts/kconfig/Makefile | 10 ++++++++++
>  3 files changed, 12 insertions(+)
>  create mode 100644 kernel/configs/be.config
>  create mode 100644 kernel/configs/le.config
> 
> diff --git a/kernel/configs/be.config b/kernel/configs/be.config
> new file mode 100644
> index 0000000..c5cdc99
> --- /dev/null
> +++ b/kernel/configs/be.config
> @@ -0,0 +1 @@
> +CONFIG_CPU_BIG_ENDIAN=y
> diff --git a/kernel/configs/le.config b/kernel/configs/le.config
> new file mode 100644
> index 0000000..be479cf
> --- /dev/null
> +++ b/kernel/configs/le.config
> @@ -0,0 +1 @@
> +# CONFIG_CPU_BIG_ENDIAN is not set
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index d79cba4..2e8007e 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -126,6 +126,14 @@ PHONY += tinyconfig
>  tinyconfig:
>  	$(Q)$(MAKE) -f $(srctree)/Makefile allnoconfig tiny.config
>  
> +PHONY += beconfig
> +beconfig: be.config
> +	@:
> +
> +PHONY += leconfig
> +leconfig: le.config
> +	@:
> +
>  # Help text used by make help
>  help:
>  	@echo  '  config	  - Update current config utilising a line-oriented program'
> @@ -151,6 +159,8 @@ help:
>  	@echo  '  kvmconfig	  - Enable additional options for kvm guest kernel support'
>  	@echo  '  xenconfig       - Enable additional options for xen dom0 and guest kernel support'
>  	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
> +	@echo  '  beconfig	  - Update current config to use big endian CPU'
> +	@echo  '  leconfig	  - Update current config to use little endian CPU'
>  
>  # lxdialog stuff
>  check-lxdialog  := $(srctree)/$(src)/lxdialog/check-lxdialog.sh
> 


-- 
Florian
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