linux-kernel - Re: include architecture Kconfig files from top-level Kconfig v3

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Message-ID: <CAK7LNASd0YCj4wwmT9-6GYiBz=wDoXkmQW2F_5XjbCzS9-weUw@mail.gmail.com>
Date:   Fri, 27 Jul 2018 10:32:19 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Richard Weinberger <richard@....at>,
        Ley Foon Tan <lftan@...era.com>,
        Michal Simek <monstr@...str.eu>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-um@...ts.infradead.org, linux-arch@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: include architecture Kconfig files from top-level Kconfig v3

2018-07-27 2:21 GMT+09:00 Christoph Hellwig <hch@....de>:
> On Wed, Jul 25, 2018 at 01:30:24PM +0900, Masahiro Yamada wrote:
>> Could you check the difference of CONFIG_PREEMPT_COUNT, please?
>>
>>
>> For alpha, hexagon, um,
>> CONFIG_PREEMPT_COUNT was previously never enabled
>> because kernel/Kconfig.preempt was not included.
>>
>> Now, CONFIG_PREEMPT_COUNT can be enabled
>> if it is select'ed by someone.
>>
>> I guess this change will be OK, but
>> I'd like you and Randy to double-check it just in case.
>
> It might be fine, but with this little fix folded in we should be
> safer:
>
> diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
> index cd1655122ec0..1321a4a7a677 100644
> --- a/kernel/Kconfig.preempt
> +++ b/kernel/Kconfig.preempt
> @@ -57,4 +57,5 @@ config PREEMPT
>  endchoice
>
>  config PREEMPT_COUNT
> -       bool
> \ No newline at end of file
> +       depends on !ARCH_NO_PREEMPT
> +       bool
> --
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This will just add a new unmet dependency warning.
CONFIG_PREEMPT_COUNT will be still selected.


$ make ARCH=alpha allyesconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf  --allyesconfig Kconfig

WARNING: unmet direct dependencies detected for PREEMPT_COUNT
  Depends on [n]: !ARCH_NO_PREEMPT [=y]
  Selected by [y]:
  - DEBUG_ATOMIC_SLEEP [=y] && DEBUG_KERNEL [=y]
#
# configuration written to .config
#






-- 
Best Regards
Masahiro Yamada