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Commit 29133260 authored by Eugeniy Paltsev's avatar Eugeniy Paltsev Committed by Vineet Gupta
Browse files

ARC: perf: avoid kernel killing where it is possible 



No, not gonna die tonight.

Signed-off-by: default avatarEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent baf9cc85

arch/arc/kernel/perf_event.c

+4 −2
Original line number Diff line number Diff line
@@ -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)