linux-kernel - Re: [PATCH] rtw88: avoid unused function warnings

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Date:   Thu, 09 Apr 2020 07:29:39 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Yan-Hsuan Chuang <yhchuang@...ltek.com>,
        Chin-Yen Lee <timlee@...ltek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Brian Norris <briannorris@...omium.org>,
        Chris Chiu <chiu@...lessm.com>,
        Jian-Hong Pan <jian-hong@...lessm.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtw88: avoid unused function warnings

Arnd Bergmann <arnd@...db.de> writes:

> The rtw88 driver defines emtpy functions with multiple indirections
> but gets one of these wrong:
>
> drivers/net/wireless/realtek/rtw88/pci.c:1347:12: error: 'rtw_pci_resume' defined but not used [-Werror=unused-function]
>  1347 | static int rtw_pci_resume(struct device *dev)
>       |            ^~~~~~~~~~~~~~
> drivers/net/wireless/realtek/rtw88/pci.c:1342:12: error: 'rtw_pci_suspend' defined but not used [-Werror=unused-function]
>  1342 | static int rtw_pci_suspend(struct device *dev)
>
> Better simplify it to rely on the conditional reference in
> SIMPLE_DEV_PM_OPS(), and mark the functions as __maybe_unused to avoid
> warning about it.
>
> I'm not sure if these are needed at all given that the functions
> don't do anything, but they were only recently added.
>
> Fixes: 44bc17f7f5b3 ("rtw88: support wowlan feature for 8822c")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

I'll queue this to v5.7.

-- 
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