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

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Message-Id: <20170823134303.1000996-1-arnd@arndb.de>
Date:   Wed, 23 Aug 2017 15:42:45 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Rob Clark <robdclark@...il.com>, Joerg Roedel <joro@...tes.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        iommu@...ts.linux-foundation.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: qcom: annotate PM functions as __maybe_unused

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(-)

diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index 48b62aa52787..c8a587d034b0 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -860,8 +860,7 @@ static int qcom_iommu_device_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int qcom_iommu_resume(struct device *dev)
+static int __maybe_unused qcom_iommu_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
@@ -869,7 +868,7 @@ static int qcom_iommu_resume(struct device *dev)
 	return qcom_iommu_enable_clocks(qcom_iommu);
 }
 
-static int qcom_iommu_suspend(struct device *dev)
+static int __maybe_unused qcom_iommu_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
@@ -878,7 +877,6 @@ static int qcom_iommu_suspend(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static const struct dev_pm_ops qcom_iommu_pm_ops = {
 	SET_RUNTIME_PM_OPS(qcom_iommu_suspend, qcom_iommu_resume, NULL)
-- 
2.9.0