linux-kernel - Re: [PATCH] iommu: omap: mark pm functions __maybe

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Message-ID: <20150686-f14c-389b-7345-699cee191116@ti.com>
Date:   Fri, 6 Sep 2019 10:24:19 -0500
From:   Suman Anna <s-anna@...com>
To:     Arnd Bergmann <arnd@...db.de>, Joerg Roedel <joro@...tes.org>
CC:     Joerg Roedel <jroedel@...e.de>, Tero Kristo <t-kristo@...com>,
        Will Deacon <will@...nel.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iommu: omap: mark pm functions __maybe_unused

Hi Arnd,

On 9/6/19 10:15 AM, Arnd Bergmann wrote:
> The runtime_pm functions are unused when CONFIG_PM is disabled:
> 
> drivers/iommu/omap-iommu.c:1022:12: error: unused function 'omap_iommu_runtime_suspend' [-Werror,-Wunused-function]
> static int omap_iommu_runtime_suspend(struct device *dev)
> drivers/iommu/omap-iommu.c:1064:12: error: unused function 'omap_iommu_runtime_resume' [-Werror,-Wunused-function]
> static int omap_iommu_runtime_resume(struct device *dev)
> 
> Mark them as __maybe_unused to let gcc silently drop them
> instead of warning.

Curious, what defconfig is this? OMAP drivers won't be functional in
general without pm_runtime, so CONFIG_PM is mandatory. But from just a
CONFIG_PM option point of view, agree with the patch.

> 
> Fixes: db8918f61d51 ("iommu/omap: streamline enable/disable through runtime pm callbacks")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Suman Anna <s-anna@...com>

> ---
>  drivers/iommu/omap-iommu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
> index 451e3c98ab2d..09c6e1c680db 100644
> --- a/drivers/iommu/omap-iommu.c
> +++ b/drivers/iommu/omap-iommu.c
> @@ -1019,7 +1019,7 @@ EXPORT_SYMBOL_GPL(omap_iommu_domain_activate);
>   * reset line. This function also saves the context of any
>   * locked TLBs if suspending.
>   **/
> -static int omap_iommu_runtime_suspend(struct device *dev)
> +static __maybe_unused int omap_iommu_runtime_suspend(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct iommu_platform_data *pdata = dev_get_platdata(dev);
> @@ -1061,7 +1061,7 @@ static int omap_iommu_runtime_suspend(struct device *dev)
>   * reset line. The function also restores any locked TLBs if
>   * resuming after a suspend.
>   **/
> -static int omap_iommu_runtime_resume(struct device *dev)
> +static __maybe_unused int omap_iommu_runtime_resume(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct iommu_platform_data *pdata = dev_get_platdata(dev);
>