linux-kernel - Re: [PATCH] kconfig: tinyconfig: provide whole choice blocks to avoid warnings

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Date:	Thu, 21 Jul 2016 10:21:13 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	"Yann E . MORIN" <yann.morin.1998@...e.fr>,
	Josh Triplett <josh@...htriplett.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	kernel-build-reports@...ts.linaro.org,
	Thiago Macieira <thiago.macieira@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kconfig: tinyconfig: provide whole choice blocks to avoid warnings

Hi Arnd,


2016-07-19 1:00 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
> Using "make tinyconfig" produces a couple of annoying warnings that show up
> for build test machines all the time:
>
>     .config:966:warning: override: NOHIGHMEM changes choice state
>     .config:965:warning: override: SLOB changes choice state
>     .config:963:warning: override: KERNEL_XZ changes choice state
>     .config:962:warning: override: CC_OPTIMIZE_FOR_SIZE changes choice state
>     .config:933:warning: override: SLOB changes choice state
>     .config:930:warning: override: CC_OPTIMIZE_FOR_SIZE changes choice state
>     .config:870:warning: override: SLOB changes choice state
>     .config:868:warning: override: KERNEL_XZ changes choice state
>     .config:867:warning: override: CC_OPTIMIZE_FOR_SIZE changes choice state
>
> I've made a previous attempt at fixing them and we discussed a number of
> alternatives.
>
> I tried changing the Makefile to use "merge_config.sh -n $(fragment-list)"
> but couldn't get that to work properly.
>
> This is yet another approach, based on the observation that we do want
> to see a warning for conflicting 'choice' options, and that we can simply
> make them non-conflicting by listing all other options as disabled.
> This is a trivial patch that we can apply independent of plans for other
> changes.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Link: https://storage.kernelci.org/mainline/v4.7-rc6/x86-tinyconfig/build.log
> https://patchwork.kernel.org/patch/9212749/
> ---
>  kernel/configs/tiny.config | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/kernel/configs/tiny.config b/kernel/configs/tiny.config
> index c2de56ab0fce..3eeade4d876d 100644
> --- a/kernel/configs/tiny.config
> +++ b/kernel/configs/tiny.config
> @@ -1,4 +1,12 @@
>  CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> +# CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE is not set
>  CONFIG_KERNEL_XZ=y
> +# CONFIG_KERNEL_GZIP is not set
> +# CONFIG_KERNEL_BZIP2 is not set
> +# CONFIG_KERNEL_LZMA is not set
> +# CONFIG_KERNEL_LZO is not set
> +# CONFIG_KERNEL_LZ4 is not set
>  CONFIG_OPTIMIZE_INLINING=y
> +# CONFIG_SLUB is not set
> +# CONFIG_SLAB is not set
>  CONFIG_SLOB=y


Which sorting policy are you using here?


I prefer the same order as they appear in the .config file.
Like this.


+# CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE is not set
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+# CONFIG_KERNEL_GZIP is not set
+# CONFIG_KERNEL_BZIP2 is not set
+# CONFIG_KERNEL_LZMA is not set
 CONFIG_KERNEL_XZ=y
+# CONFIG_KERNEL_LZO is not set
+# CONFIG_KERNEL_LZ4 is not set
 CONFIG_OPTIMIZE_INLINING=y
+# CONFIG_SLAB is not set
+# CONFIG_SLUB is not set
 CONFIG_SLOB=y


-- 
Best Regards
Masahiro Yamada