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

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Date:   Thu, 15 Mar 2018 15:36:27 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Jarod Wilson <jarod@...hat.com>,
        Prarit Bhargava <prarit@...hat.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] kbuild: hide CONFIG_TRIM_UNUSED_KSYMS code from
 external module building

2018-03-15 3:32 GMT+09:00 Nicolas Pitre <nicolas.pitre@...aro.org>:
> 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.

I could not understand this.

Unless I am missing something,
I think this code is always parsed.



>> 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
>>
>>



-- 
Best Regards
Masahiro Yamada