linux-kernel - Re: [PATCH 1/3] kbuild: add kbuild-file macro

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Date:   Fri, 18 Nov 2022 09:45:52 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nicolas Schier <nicolas@...sle.eu>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH 1/3] kbuild: add kbuild-file macro

On Fri, Nov 18, 2022 at 5:47 AM Nicolas Schier <nicolas@...sle.eu> wrote:
>
> On Sun, 13 Nov 2022 20:15:23 +0900 Masahiro Yamada wrote:
> > While building, installing, cleaning, Kbuild visits sub-directories
> > and includes 'Kbuild' or 'Makefile' that exists there.
> >
> > Add 'kbuild-file' macro, and reuse it from scripts/Makefie.*
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  scripts/Kbuild.include       | 5 +++++
> >  scripts/Makefile.asm-generic | 6 +++---
> >  scripts/Makefile.build       | 6 +-----
> >  scripts/Makefile.clean       | 5 +----
> >  scripts/Makefile.dtbinst     | 2 +-
> >  5 files changed, 11 insertions(+), 13 deletions(-)
> >
> > diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> > index 2bc08ace38a3..cbe28744637b 100644
> > --- a/scripts/Kbuild.include
> > +++ b/scripts/Kbuild.include
> > @@ -40,6 +40,11 @@ escsq = $(subst $(squote),'\$(squote)',$1)
> >  # Quote a string to pass it to C files. foo => '"foo"'
> >  stringify = $(squote)$(quote)$1$(quote)$(squote)
> >
> > +###
> > +# The path to Kbuild or Makefile. Kbuild has precedence over Makefile.
> > +kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
> > +kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
> > +
> >  ###
> >  # Easy method for doing a status message
> >         kecho := :
> > diff --git a/scripts/Makefile.asm-generic b/scripts/Makefile.asm-generic
> > index 1d501c57f9ef..8d01b37b7677 100644
> > --- a/scripts/Makefile.asm-generic
> > +++ b/scripts/Makefile.asm-generic
> > @@ -10,15 +10,15 @@ PHONY := all
> >  all:
> >
> >  src := $(subst /generated,,$(obj))
> > --include $(src)/Kbuild
> > +
> > +include $(srctree)/scripts/Kbuild.include
> > +-include $(kbuild-file)
> >
> >  # $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
> >  ifneq ($(SRCARCH),um)
> >  include $(srctree)/$(generic)/Kbuild
> >  endif
> >
> > -include $(srctree)/scripts/Kbuild.include
> > -
> >  redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
> >  redundant += $(foreach f, $(generic-y), $(if $(wildcard $(srctree)/$(src)/$(f)),$(f)))
> >  redundant := $(sort $(redundant))
> > diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> > index 41f3602fc8de..37cf88d076e8 100644
> > --- a/scripts/Makefile.build
> > +++ b/scripts/Makefile.build
> > @@ -38,11 +38,7 @@ subdir-ccflags-y :=
> >
> >  include $(srctree)/scripts/Kbuild.include
> >  include $(srctree)/scripts/Makefile.compiler
> > -
> > -# The filename Kbuild has precedence over Makefile
> > -kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
> > -include $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
> > -
> > +include $(kbuild-file)
> >  include $(srctree)/scripts/Makefile.lib
> >
> >  # Do not include hostprogs rules unless needed.
> > diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
> > index 878cec648959..3649900696dd 100644
> > --- a/scripts/Makefile.clean
> > +++ b/scripts/Makefile.clean
> > @@ -9,10 +9,7 @@ PHONY := __clean
> >  __clean:
> >
> >  include $(srctree)/scripts/Kbuild.include
> > -
> > -# The filename Kbuild has precedence over Makefile
> > -kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
> > -include $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
> > +include $(kbuild-file)
> >
> >  # Figure out what we need to build from the various variables
> >  # ==========================================================================
> > diff --git a/scripts/Makefile.dtbinst b/scripts/Makefile.dtbinst
> > index 190d781e84f4..2ab936e4179d 100644
> > --- a/scripts/Makefile.dtbinst
> > +++ b/scripts/Makefile.dtbinst
> > @@ -15,7 +15,7 @@ __dtbs_install:
> >
> >  include include/config/auto.conf
> >  include $(srctree)/scripts/Kbuild.include
> > -include $(src)/Makefile
> > +include $(kbuild-file)
> >
> >  dtbs    := $(addprefix $(dst)/, $(dtb-y) $(if $(CONFIG_OF_ALL_DTBS),$(dtb-)))
> >  subdirs := $(addprefix $(obj)/, $(subdir-y) $(subdir-m))
> > --
> > 2.34.1
>
> Reviewed-by: Nicolas Schier <nicolas@...sle.eu>
>
> What do you think about using $(kbuild-file) also in Makefile.modpost?


Yes, we can replace it as well.
I will fix it.

Thanks for the close review, as always!






>
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -93,7 +93,7 @@ obj := $(KBUILD_EXTMOD)
>  src := $(obj)
>
>  # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
> -include $(or $(wildcard $(src)/Kbuild), $(src)/Makefile)
> +include $(kbuild-file)
>
>  module.symvers-if-present := $(wildcard Module.symvers)
>  output-symdump := $(KBUILD_EXTMOD)/Module.symvers
>
>
> Kind regards,
> Nicolas
>
> --
> epost|xmpp: nicolas@...sle.eu          irc://oftc.net/nsc
> ↳ gpg: 18ed 52db e34f 860e e9fb  c82b 7d97 0932 55a0 ce7f
>      -- frykten for herren er opphav til kunnskap --



-- 
Best Regards
Masahiro Yamada