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

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Message-ID: <CAK8P3a3ByLmeQirVNEumSMGhzs7XFRZujudE81WQhvhLEZprdw@mail.gmail.com>
Date:   Fri, 6 Sep 2019 17:58:38 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Suman Anna <s-anna@...com>
Cc:     Joerg Roedel <joro@...tes.org>, Joerg Roedel <jroedel@...e.de>,
        Tero Kristo <t-kristo@...com>, Will Deacon <will@...nel.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iommu: omap: mark pm functions __maybe_unused

On Fri, Sep 6, 2019 at 5:24 PM Suman Anna <s-anna@...com> wrote:
>
> 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.

I did some randconfig builds for testing the stuff I merged for 5.4.
I don't think there are any defconfigs without CONFIG_PM.

      Arnd