linux-kernel - Re: [PATCH v2] i2c: i801: fix unused-function warning

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Message-ID: <CAHp75VdJEzDsvJmv812wvc5p=frqc3KU8HW=y4cGULYEp4=SKQ@mail.gmail.com>
Date:   Mon, 14 May 2018 20:18:37 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Jean Delvare <jdelvare@...e.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] i2c: i801: fix unused-function warning

On Mon, May 14, 2018 at 12:33 PM, Anders Roxell
<anders.roxell@...aro.org> wrote:
> With CONFIG_PM, we get a harmless build warning:
> drivers/i2c/busses/i2c-i801.c:1723:12: warning: ‘i801_resume’ defined but not used [-Wunused-function]
>  static int i801_resume(struct device *dev)
>             ^~~~~~~~~~~
> drivers/i2c/busses/i2c-i801.c:1714:12: warning: ‘i801_suspend’ defined but not used [-Wunused-function]
>  static int i801_suspend(struct device *dev)
>             ^~~~~~~~~~~~

> -#ifdef CONFIG_PM
> +#ifdef CONFIG_PM_SLEEP
>  static int i801_suspend(struct device *dev)

The better pattern is to get rid of ugly ifdef and supply
__maybe_unused annotation to each function in question.


-- 
With Best Regards,
Andy Shevchenko