linux-kernel - Re: [PATCH RFC] kbuild: improvement in Makefile.modbuiltin

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Message-ID: <c0dc5fb3-acad-6bfb-0af2-f8a8e085aec0@cn.fujitsu.com>
Date:   Mon, 20 Nov 2017 19:50:20 +0800
From:   Cao jin <caoj.fnst@...fujitsu.com>
To:     <linux-kbuild@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <yamada.masahiro@...ionext.com>, <michal.lkml@...kovi.net>
Subject: Re: [PATCH RFC] kbuild: improvement in Makefile.modbuiltin



On 11/18/2017 07:23 PM, Cao jin wrote:
> Drop unnecessary "__subdir-Y" and `cat /dev/null`
> 
> Signed-off-by: Cao jin <caoj.fnst@...fujitsu.com>
> ---
> Don't know why they exist, but a simple build is fine without them
> in my test
> 
>  scripts/Makefile.modbuiltin | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/scripts/Makefile.modbuiltin b/scripts/Makefile.modbuiltin
> index a763b4775d06..cbb1e3dc1ef9 100644
> --- a/scripts/Makefile.modbuiltin
> +++ b/scripts/Makefile.modbuiltin
> @@ -26,8 +26,7 @@ kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbui
>  include $(kbuild-file)
>  
>  include scripts/Makefile.lib
> -__subdir-Y     := $(patsubst %/,%,$(filter %/, $(obj-Y)))
> -subdir-Y       += $(__subdir-Y)
> +subdir-Y       := $(patsubst %/,%,$(filter %/, $(obj-Y)))
>  subdir-ym      := $(sort $(subdir-y) $(subdir-Y) $(subdir-m))
>  subdir-ym      := $(addprefix $(obj)/,$(subdir-ym))
>  obj-Y          := $(addprefix $(obj)/,$(obj-Y))
> @@ -41,7 +40,7 @@ __modbuiltin: $(modbuiltin-target) $(subdir-ym)
>  
>  $(modbuiltin-target): $(subdir-ym) FORCE
>  	$(Q)(for m in $(modbuiltin-mods); do echo kernel/$$m; done;	\
> -	cat /dev/null $(modbuiltin-subdirs)) > $@
> +	cat $(modbuiltin-subdirs)) > $@
>  

I take this patch back, this change does has something wrong in the
test. I guess I didn't test it in a pure clean source that day.

Sorry for the noise.

>  PHONY += FORCE
>  
> 

-- 
Sincerely,
Cao jin