linux-kernel - Re: [PATCH] modpost: make KBUILD_MODPOST_WARN also configurable for external modules

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Date:   Sun, 7 Apr 2019 18:04:51 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     "Wiebe, Wladislav (Nokia - DE/Ulm)" <wladislav.wiebe@...ia.com>
Cc:     "michal.lkml@...kovi.net" <michal.lkml@...kovi.net>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jonas Gorski <jonas.gorski@...il.com>
Subject: Re: [PATCH] modpost: make KBUILD_MODPOST_WARN also configurable for
 external modules

(+CC Jonas Gorski)


On Tue, Mar 26, 2019 at 6:58 PM Wiebe, Wladislav (Nokia - DE/Ulm)
<wladislav.wiebe@...ia.com> wrote:
>
> Commit ea837f1c0503 ("kbuild: make modpost processing configurable")
> was intended to give KBUILD_MODPOST_WARN flexibility to be configurable.
> Right now KBUILD_MODPOST_WARN gets just ignored when KBUILD_EXTMOD is
> set which happens per default when building modules out of the tree.
>
> This change gives the opportunity to define module build behaving also
> in case of out of tree builds and default will become exit on error.
> Errors which can be detected by the build should be trapped out of the box
> there, unless somebody wants to notice broken stuff later at runtime.

If an external module refers to a symbol
provided by another external module,
this patch will turn the warning into the error by default,
which is probably a bad idea.


I suggested a desired change in the following.
https://patchwork.kernel.org/patch/9980691/

I am poking Jonas Gorski
if he plans to send v2.


> Signed-off-by: Wladislav Wiebe <wladislav.wiebe@...ia.com>
> ---
>  scripts/Makefile.modpost | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> index 6b7f354f189a..fec6ec2ffa47 100644
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -78,7 +78,7 @@ modpost = scripts/mod/modpost                    \
>   $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \
>   $(if $(KBUILD_EXTMOD),-o $(modulesymfile))      \
>   $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)  \
> - $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
> + $(if $(KBUILD_MODPOST_WARN),-w)
>
>  MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS)))
>
> --
> 2.19.2



-- 
Best Regards
Masahiro Yamada