linux-kernel - Re: [PATCH v2 1/2] kconfig.h: Add IF

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Date:   Mon, 14 Dec 2020 10:05:30 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Arnd Bergmann <arnd@...nel.org>, od@...c.me,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Zhou Yanjie <zhouyanjie@...yeetech.com>
Subject: Re: [PATCH v2 1/2] kconfig.h: Add IF_ENABLED() macro

On Mon, Dec 14, 2020 at 12:54 AM Paul Cercueil <paul@...pouillou.net> wrote:

> IF_ENABLED(CONFIG_FOO, ptr) evaluates to (ptr) if CONFIG_FOO is set to 'y'
> or 'm', NULL otherwise. The (ptr) argument must be a pointer.
>
> The IF_ENABLED() macro can be very useful to help GCC drop dead code.

I can apply this with the other patch to the pinctrl subsystem if Arnd or
someone else who is good at KConfig provides an ACK.

Yours,
Linus Walleij