linux-kernel - Re: [PATCH] iommu: qcom: annotate PM functions as __maybe

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Date:   Mon, 28 Aug 2017 11:25:17 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Rob Clark <robdclark@...il.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        iommu@...ts.linux-foundation.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: qcom: annotate PM functions as __maybe_unused

On Wed, Aug 23, 2017 at 03:42:45PM +0200, Arnd Bergmann wrote:
> The qcom_iommu_disable_clocks() function is only called from PM
> code that is hidden in an #ifdef, causing a harmless warning without
> CONFIG_PM:
> 
> drivers/iommu/qcom_iommu.c:601:13: error: 'qcom_iommu_disable_clocks' defined but not used [-Werror=unused-function]
>  static void qcom_iommu_disable_clocks(struct qcom_iommu_dev *qcom_iommu)
> drivers/iommu/qcom_iommu.c:581:12: error: 'qcom_iommu_enable_clocks' defined but not used [-Werror=unused-function]
>  static int qcom_iommu_enable_clocks(struct qcom_iommu_dev *qcom_iommu)
> 
> Replacing that #ifdef with __maybe_unused annotations lets the compiler
> drop the functions silently instead.
> 
> Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/iommu/qcom_iommu.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Applied, thanks.