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

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Date:   Fri, 30 Dec 2022 12:08:31 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nicolas Schier <nicolas@...sle.eu>
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 4:47 AM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> 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.

Ah, thanks. I will fix it.


>
> >
> > 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?

Your understanding is correct.
Automatic variables can have 'D' / 'F', as explained in the manual.
https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html


Yes, it is just my personal preference.
Perhaps, I did not need to change it, though.






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


-- 
Best Regards
Masahiro Yamada