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

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Date:   Thu, 17 Nov 2022 21:47:02 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
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 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?


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

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