linux-kernel - [PATCH v3 2/3] perf/smmuv3: Add a MODULE_SOFTDEP() to indicate dependency on SMMU

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Date:   Wed, 27 Jan 2021 19:32:57 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        "Mark Rutland" <mark.rutland@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Subject: [PATCH v3 2/3] perf/smmuv3: Add a MODULE_SOFTDEP() to indicate dependency on SMMU

The MODULE_SOFTDEP() gives user space a hint of the loading sequence. And
when command "modprobe arm_smmuv3_pmu" is executed, the arm_smmu_v3.ko is
automatically loaded in advance.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 drivers/perf/arm_smmuv3_pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index e5e505a0804fe53..9a305ac51208cd2 100644
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -950,6 +950,7 @@ static void __exit arm_smmu_pmu_exit(void)
 module_exit(arm_smmu_pmu_exit);
 
 MODULE_DESCRIPTION("PMU driver for ARM SMMUv3 Performance Monitors Extension");
+MODULE_SOFTDEP("pre: arm_smmu_v3");
 MODULE_AUTHOR("Neil Leeder <nleeder@...eaurora.org>");
 MODULE_AUTHOR("Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>");
 MODULE_LICENSE("GPL v2");
-- 
1.8.3