linux-kernel - Re: [PATCH v2 07/10] kbuild: get rid of duplication in the first line of *.mod files

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Date:   Tue, 5 Apr 2022 22:16:16 +0200
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2 07/10] kbuild: get rid of duplication in the first
 line of *.mod files

On Tue, Apr 05, 2022 at 08:33:55PM +0900 Masahiro Yamada wrote:
> The first line of *.mod lists the member objects of the module.
> This list may contain duplication if the same object is added multiple
> times, like this:
> 
>   obj-m := foo.o
>   foo-$(CONFIG_FOO1_X) += foo1.o
>   foo-$(CONFIG_FOO1_Y) += foo1.o
>   foo-$(CONFIG_FOO2_X) += foo2.o
>   foo-$(CONFIG_FOO2_Y) += foo2.o
> 
> This is probably not a big deal. As far as I know, the only small
> problem is scripts/mod/sumversion.c parses the same file over again.
> This can be avoided by adding $(sort ...). It has a side-effect that
> sorts the objects alphabetically, but it is not a big deal, either.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
> Changes in v2:
>   - new
> 
>  scripts/Makefile.build | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 3ef2373f0a57..63625877aeae 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -307,8 +307,10 @@ $(obj)/%.prelink.o: $(obj)/%.o FORCE
>  	$(call if_changed,cc_prelink_modules)
>  endif
>  
> +multi-m-prereqs = $(sort $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)))
> +
>  cmd_mod = { \
> -	echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
> +	echo $(if $(multi-m-prereqs), $(multi-m-prereqs), $(@:.mod=.o)); \

I'd rather expected to see $(or) here, too, as in commit 5c8166419acf ("kbuild:
replace $(if A,A,B) with $(or A,B)").

Reviewed-by: Nicolas Schier <nicolas@...sle.eu>

>  	$(undefined_syms) echo; \
>  	} > $@
>  
> -- 
> 2.32.0
> 
> 

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