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Subject: Re: [PATCH 2/2] usb: xhci: tegra: mark PM functions as __maybe_unused
To:     Arnd Bergmann <arnd@kernel.org>,
        Mathias Nyman <mathias.nyman@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>
CC:     Arnd Bergmann <arnd@arndb.de>, <linux-usb@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>
References: <20210421135613.3560777-1-arnd@kernel.org>
 <20210421135613.3560777-2-arnd@kernel.org>
From:   JC Kuo <jckuo@nvidia.com>
Organization: NVIDIA
Message-ID: <865bdda5-77c5-a9fa-f563-b40d76dd8a81@nvidia.com>
Date:   Thu, 22 Apr 2021 09:54:50 +0800
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Hi Arnd,
Thanks for the fix.

Reviewed-by: JC Kuo <jckuo@nvidia.com>


On 4/21/21 9:56 PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The added #ifdefs in the PM rework were almost correct, but still
> cause warnings in some randconfig builds:
> 
> drivers/usb/host/xhci-tegra.c:2147:12: error: 'tegra_xusb_resume' defined but not used [-Werror=unused-function]
>  2147 | static int tegra_xusb_resume(struct device *dev)
>       |            ^~~~~~~~~~~~~~~~~
> drivers/usb/host/xhci-tegra.c:2105:12: error: 'tegra_xusb_suspend' defined but not used [-Werror=unused-function]
>  2105 | static int tegra_xusb_suspend(struct device *dev)
> 
> Replace the #ifdef checks with simpler __maybe_unused annotations to
> reliably shut up these warnings.
> 
> Fixes: d64d362f1d8b ("usb: xhci: tegra: Enable ELPG for runtime/system PM")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/usb/host/xhci-tegra.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
> index ce97ff054c68..adead2377149 100644
> --- a/drivers/usb/host/xhci-tegra.c
> +++ b/drivers/usb/host/xhci-tegra.c
> @@ -1787,7 +1787,6 @@ static int tegra_xusb_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#if IS_ENABLED(CONFIG_PM) || IS_ENABLED(CONFIG_PM_SLEEP)
>  static bool xhci_hub_ports_suspended(struct xhci_hub *hub)
>  {
>  	struct device *dev = hub->hcd->self.controller;
> @@ -2102,7 +2101,7 @@ static int tegra_xusb_exit_elpg(struct tegra_xusb *tegra, bool runtime)
>  	return err;
>  }
>  
> -static int tegra_xusb_suspend(struct device *dev)
> +static __maybe_unused int tegra_xusb_suspend(struct device *dev)
>  {
>  	struct tegra_xusb *tegra = dev_get_drvdata(dev);
>  	int err;
> @@ -2144,7 +2143,7 @@ static int tegra_xusb_suspend(struct device *dev)
>  	return err;
>  }
>  
> -static int tegra_xusb_resume(struct device *dev)
> +static __maybe_unused int tegra_xusb_resume(struct device *dev)
>  {
>  	struct tegra_xusb *tegra = dev_get_drvdata(dev);
>  	int err;
> @@ -2174,10 +2173,8 @@ static int tegra_xusb_resume(struct device *dev)
>  
>  	return 0;
>  }
> -#endif
>  
> -#ifdef CONFIG_PM
> -static int tegra_xusb_runtime_suspend(struct device *dev)
> +static __maybe_unused int tegra_xusb_runtime_suspend(struct device *dev)
>  {
>  	struct tegra_xusb *tegra = dev_get_drvdata(dev);
>  	int ret;
> @@ -2190,7 +2187,7 @@ static int tegra_xusb_runtime_suspend(struct device *dev)
>  	return ret;
>  }
>  
> -static int tegra_xusb_runtime_resume(struct device *dev)
> +static __maybe_unused int tegra_xusb_runtime_resume(struct device *dev)
>  {
>  	struct tegra_xusb *tegra = dev_get_drvdata(dev);
>  	int err;
> @@ -2201,7 +2198,6 @@ static int tegra_xusb_runtime_resume(struct device *dev)
>  
>  	return err;
>  }
> -#endif
>  
>  static const struct dev_pm_ops tegra_xusb_pm_ops = {
>  	SET_RUNTIME_PM_OPS(tegra_xusb_runtime_suspend,
>