From: Paul Bolle <pebolle@tiscali.nl>
To: Bjorn Helgaas <bhelgaas@google.com>, Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH] CodingStyle: Expand IS_ENABLED() documentation
Date: Tue, 27 Sep 2016 21:32:08 +0200 [thread overview]
Message-ID: <1475004728.16606.8.camel@tiscali.nl> (raw)
In-Reply-To: <20160927190802.13636.10320.stgit@bhelgaas-glaptop2.roam.corp.google.com>
On Tue, 2016-09-27 at 14:08 -0500, Bjorn Helgaas wrote:
> --- a/Documentation/CodingStyle
> +++ b/Documentation/CodingStyle
> +Because the compiler processes the block, you have to use an #ifdef instead
> +of IS_ENABLED() when code inside the block references symbols that will not
> +exist if the condition is not met. Different CONFIG_FOO autoconf.h symbols
> +are generated for modular Kconfig options than for builtin ones, so you
> +need "#if defined(CONFIG_FOO) || defined(CONFIG_FOO_MODULE)"
Isn't that equivalent to "#if IS_ENABLED(CONFIG_FOO)"?
> if FOO can be
> +a module:
> +
> + .config include/generated/autoconf.h
> + ------------ ----------------------------
> + CONFIG_FOO=y #define CONFIG_FOO 1
> + CONFIG_FOO=m #define CONFIG_FOO_MODULE 1
Paul Bolle
next prev parent reply other threads:[~2016-09-27 19:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-27 19:08 Bjorn Helgaas
2016-09-27 19:32 ` Paul Bolle [this message]
2016-09-27 20:32 ` Bjorn Helgaas
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