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ARC: perf: avoid kernel killing where it is possible

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No, not gonna die tonight.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Eugeniy Paltsev 2018-12-13 19:56:21 +03:00 committed by Vineet Gupta
parent baf9cc85ba
commit 29133260f7
1 changed files with 4 additions and 2 deletions
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6
arch/arc/kernel/perf_event.c
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@ -580,10 +580,12 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
return -ENODEV;
}
BUILD_BUG_ON(ARC_PERF_MAX_COUNTERS > 32);
BUG_ON(pct_bcr.c > ARC_PERF_MAX_COUNTERS);
if (WARN_ON(pct_bcr.c > ARC_PERF_MAX_COUNTERS))
return -EINVAL;
READ_BCR(ARC_REG_CC_BUILD, cc_bcr);
BUG_ON(!cc_bcr.v); /* Counters exist but No countable conditions ? */
if (WARN(!cc_bcr.v, "Counters exist but No countable conditions?"))
return -EINVAL;
arc_pmu = devm_kzalloc(&pdev->dev, sizeof(struct arc_pmu), GFP_KERNEL);
if (!arc_pmu)