From mboxrd@z Thu Jan  1 00:00:00 1970
From: Valdis.Kletnieks@vt.edu (Valdis.Kletnieks at vt.edu)
Date: Thu, 24 Sep 2015 11:00:02 -0400
Subject: getting warning when a method parameter in a kernel module is not
	used
In-Reply-To: <CAGXs5wVPLqVWRZy9wwZ5H-KZf21yCZ-ors9HpzdrT32GMXbBbQ@mail.gmail.com>
References: <CAGXs5wVPLqVWRZy9wwZ5H-KZf21yCZ-ors9HpzdrT32GMXbBbQ@mail.gmail.com>
Message-ID: <3590.1443106802@turing-police.cc.vt.edu>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Thu, 24 Sep 2015 17:25:15 +0300, Kevin Wilson said:
> Hi,
>
> When a method parameter in a kernel module is not used, we do not get
> any warning (as opposed to a variable which is not used).
>
> Is there any compilation flag which enables getting warning in such a case ?

No, and it's unclear that it would be worthwhile.

Consider a kernel module that implements a device driver, and the ->ioctl()
only implements ioctl(fd,START|STOP|PAUSE|RESUME,/* ignored parameter */).

Or any other case where there's a generic struct of pointers to functions that
have fixed signatures, but for a given module, we don't need to access one.