Extern or forward variable declaration at include/linux/reset-controller.h, line 84 References: drivers/clk/qcom/gcc-ipq806x.c, line 2986 drivers/clk/qcom/gcc-msm8916.c, line 3386 drivers/clk/qcom/gcc-msm8960.c, line 3459 drivers/clk/qcom/gcc-msm8994.c, line 2288 drivers/clk/qcom/gcc-msm8996.c, line 3517 drivers/clk/qcom/mmcc-msm8996.c, line 3360 drivers/iommu/tegra-smmu.c, line 31 drivers/iommu/tegra-smmu.c, line 452 drivers/iommu/tegra-smmu.c, line 486 drivers/iommu/tegra-smmu.c, line 714 drivers/iommu/tegra-smmu.c, line 736 drivers/iommu/tegra-smmu.c, line 783 drivers/iommu/tegra-smmu.c, line 847 drivers/iommu/tegra-smmu.c, line 860 drivers/iommu/tegra-smmu.c, line 996 drivers/reset/reset-simple.c, line 136 drivers/reset/reset-uniphier-usb3.c, line 34