linux-kernel - Re: [PATCH 5/7] kbuild: hide CONFIG_TRIM_UNUSED

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Date:   Wed, 14 Mar 2018 14:32:33 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     linux-kbuild@...r.kernel.org, Jarod Wilson <jarod@...hat.com>,
        Prarit Bhargava <prarit@...hat.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] kbuild: hide CONFIG_TRIM_UNUSED_KSYMS code from
 external module building

On Thu, 15 Mar 2018, Masahiro Yamada wrote:

> If CONFIG_TRIM_UNUSED_KYMS is enabled, KBUILD_MODULES is set.  

Not when you do "make vmlinux" though.

> This code is unneeded for external module building because 
> KBUILD_MODULES is always set.  Move this code inside "ifeq 
> ($(KBUILD_EXTMOD),)" conditional.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Acked-by: Nicolas Pitre <nico@...aro.org>

> ---
> 
>  Makefile | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index decc870..e60b16f 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -603,13 +603,6 @@ else
>  include/config/auto.conf: ;
>  endif # $(dot-config)
>  
> -# For the kernel to actually contain only the needed exported symbols,
> -# we have to build modules as well to determine what those symbols are.
> -# (this can be evaluated only once include/config/auto.conf has been included)
> -ifdef CONFIG_TRIM_UNUSED_KSYMS
> -  KBUILD_MODULES := 1
> -endif
> -
>  # The all: target is the default when no target is given on the
>  # command line.
>  # This allow a user to issue only 'make' to build a kernel including modules
> @@ -1010,6 +1003,13 @@ ifdef CONFIG_TRIM_UNUSED_KSYMS
>  	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
>  endif
>  
> +# For the kernel to actually contain only the needed exported symbols,
> A+# we have to build modules as well to determine what those symbols 
are.
> +# (this can be evaluated only once include/config/auto.conf has been included)
> +ifdef CONFIG_TRIM_UNUSED_KSYMS
> +  KBUILD_MODULES := 1
> +endif
> +
>  autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
>  
>  $(autoksyms_h):
> -- 
> 2.7.4
> 
>