linux-kernel - Re: [PATCH 22/27] kbuild: generate a list of objects in vmlinux

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Date:   Wed, 27 Apr 2022 22:14:06 +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 22/27] kbuild: generate a list of objects in vmlinux

On Mon 25 Apr 2022 04:08:06 GMT Masahiro Yamada wrote:
> A *.mod file lists the member objects of a module, but vmlinux does
> not have such a file to list out all the member objects.
> 
> Generate this list to allow modpost to know all the member objects.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/link-vmlinux.sh | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index 20f44504a644..d2c193f82004 100755
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -310,7 +310,7 @@ cleanup()
>  	rm -f vmlinux
>  	rm -f vmlinux.map
>  	rm -f vmlinux.o
> -	rm -f .vmlinux.d
> +	rm -f .vmlinux*

Wouldn't it be safer to keep the removal of .vmlinux.d for some time 
and just add .vmlinux.objs?  Somehow I do not like the wildcard here.

>  }
>  
>  # Use "make V=1" to debug this script
> @@ -342,6 +342,19 @@ ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
>  modpost_link vmlinux.o
>  objtool_link vmlinux.o
>  
> +# Generate the list of objects in vmlinux
> +rm -f .vmlinux.objs
> +for f in ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS}; do
> +	case ${f} in
> +	*.a)
> +		${AR} t ${f} >> .vmlinux.objs
> +		;;
> +	*)
> +		echo ${f} >> .vmlinux.objs
> +		;;
> +	esac
> +done

just some bike shedding comment:  I would have left out the 'rm -f 
.vmlinux.objs' and moved the redirection to the end of the for loop:

for f in ...
    ...
    ${AR}
    echo
done > .vmlinux.objs

but it probably not worth.

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

> +
>  # modpost vmlinux.o to check for section mismatches
>  ${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
>  
> -- 
> 2.32.0

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