linux-kernel - Re: [PATCH] kbuild: unify cmd_dt_S_dtb and cmd_dt_S

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Date:   Thu, 29 Dec 2022 20:47:15 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] kbuild: unify cmd_dt_S_dtb and cmd_dt_S_dtbo

On Fri, Dec 30, 2022 at 03:46:50AM +0900 Masahiro Yamada wrote:
> cmd_dt_S_dtb and cmd_dt_S_dtbo are almost the same; the only differnce
> is the prefix of the bein/end symbols. (__dtb vs __dtbo)

Two letters got lost: differ_e_nce, be_g_in.

> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  scripts/Makefile.lib | 45 +++++++++++++++-----------------------------
>  1 file changed, 15 insertions(+), 30 deletions(-)
> 
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 4a4a5f67c1a6..100a386fcd71 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -368,40 +368,25 @@ DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
>  DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
>  
>  # Generate an assembly file to wrap the output of the device tree compiler
> -quiet_cmd_dt_S_dtb= DTBS    $@
> -cmd_dt_S_dtb=						\
> -{							\
> -	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
> -	echo '.section .dtb.init.rodata,"a"';		\
> -	echo '.balign STRUCT_ALIGNMENT';		\
> -	echo '.global __dtb_$(subst -,_,$(*F))_begin';	\
> -	echo '__dtb_$(subst -,_,$(*F))_begin:';		\
> -	echo '.incbin "$<" ';				\
> -	echo '__dtb_$(subst -,_,$(*F))_end:';		\
> -	echo '.global __dtb_$(subst -,_,$(*F))_end';	\
> -	echo '.balign STRUCT_ALIGNMENT'; 		\
> -} > $@
> +quiet_cmd_wrap_S_dtb = WRAP    $@
> +      cmd_wrap_S_dtb = {								\
> +		symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*));	\

As long as I know, '$(notdir $*)' should be equivalent to '$(*F)'.  Is it just
personal preference or is there some other reason for choosing one or the
other?

Nevertheless, with the typos fixed, it looks good to me:
Reviewed-by: Nicolas Schier <nicolas@...sle.eu>


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