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From 066e66d9222f70d3e21a7df077ac6b623881c9cc Mon Sep 17 00:00:00 2001
From: Max Krummenacher <max.krummenacher@toradex.com>
Date: Tue, 24 Sep 2019 14:19:24 +0200
Subject: [PATCH 2/2] ddr-perf: prevent BUG() with rt patch
With the RT patch applied the kernel prints a BUG backtrace during boot:
| BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1
Prevent this by replacing the smp_processor_id() call with a get_cpu() ..
put_cpu() construct.
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
---
drivers/perf/ddr-perf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/perf/ddr-perf.c b/drivers/perf/ddr-perf.c
index 73fe52ee8b95..744a6454d6a4 100644
--- a/drivers/perf/ddr-perf.c
+++ b/drivers/perf/ddr-perf.c
@@ -470,7 +470,8 @@ static int ddr_perf_probe(struct platform_device *pdev)
pmu->devtype = (struct fsl_ddr_devtype_data *)of_id->data;
- cpumask_set_cpu(smp_processor_id(), &pmu->cpu);
+ cpumask_set_cpu(get_cpu(), &pmu->cpu);
+ put_cpu();
ret = perf_pmu_register(&(pmu->pmu), name, -1);
if (ret)
goto ddr_perf_err;
--
2.20.1
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