linux-kernel - Re: [PATCH] l2tp: fix unused function warning

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Date:   Mon, 13 Aug 2018 20:46:37 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     jchapman@...alix.com, g.nault@...halink.fr,
        lorenzo.bianconi@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] l2tp: fix unused function warning

From: Arnd Bergmann <arnd@...db.de>
Date: Mon, 13 Aug 2018 23:43:05 +0200

> Removing one of the callers of pppol2tp_session_get_sock caused a harmless
> warning in some configurations:
> 
> net/l2tp/l2tp_ppp.c:142:21: 'pppol2tp_session_get_sock' defined but not used [-Wunused-function]
> 
> Rather than adding another #ifdef here, using a proper IS_ENABLED()
> check makes the code more readable and avoids those warnings while
> letting the compiler figure out for itself which code is needed.
> 
> This adds one pointer for the unused show() callback in struct
> l2tp_session, but that seems harmless.
> 
> Fixes: b0e29063dcb3 ("l2tp: remove pppol2tp_session_ioctl()")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.