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From: Boris Kolpackov <boris@codesynthesis.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-kbuild@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Jaroslav Kysela <perex@perex.cz>,
	Kalle Valo <kvalo@codeaurora.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Luca Coelho <luciano.coelho@intel.com>,
	Mark Brown <broonie@kernel.org>,
	Peter Ujfalusi <peter.ujfalusi@gmail.com>,
	Takashi Iwai <tiwai@suse.com>,
	alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH] kconfig: forbid symbols that end with '_MODULE'
Date: Wed, 25 Aug 2021 17:34:37 +0200	[thread overview]
Message-ID: <boris.20210825172545@codesynthesis.com> (raw)
In-Reply-To: <20210825041637.365171-1-masahiroy@kernel.org>

Masahiro Yamada <masahiroy@kernel.org> writes:

> Kconfig (syncconfig) generates include/generated/autoconf.h to make
> CONFIG options available to the pre-processor.
> 
> The macros are suffixed with '_MODULE' for symbols with the value 'm'.
> 
> Here is a conflict; CONFIG_FOO=m results in '#define CONFIG_FOO_MODULE 1',
> but CONFIG_FOO_MODULE=y also results in the same define.
> 
> fixdep always assumes CONFIG_FOO_MODULE comes from CONFIG_FOO=m, so the
> dependency is not properly tracked for symbols that end with '_MODULE'.

It seem to me the problem is in autoconf.h/fixdep, not in the Kconfig
language.


> This commit makes Kconfig error out if it finds a symbol suffixed with
> '_MODULE'.

I know you don't care, but I will voice my objection, for the record:
Kconfig is used by projects other than the Linux kernel and some of
them do not use the autoconf.h functionality. For such projects this
restriction seems arbitrary and potentially backwards-incompatible.

  parent reply	other threads:[~2021-08-25 15:42 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25  4:16 Masahiro Yamada
2021-08-25  9:52 ` Mark Brown
2021-08-25 11:59 ` Péter Ujfalusi
2021-08-26  2:28   ` Masahiro Yamada
2021-09-01  7:07     ` Péter Ujfalusi
2021-08-25 15:34 ` Boris Kolpackov [this message]
2021-08-26  2:24   ` Masahiro Yamada
2021-08-26 12:16     ` Boris Kolpackov

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