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| author | Vineet Gupta <vgupta@synopsys.com> | 2020-07-26 21:51:59 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2020-08-16 21:36:15 -0700 |
| commit | feb92d7d3813456c11dce215b3421801a78a8986 (patch) | |
| tree | ec7c0bf7fda53ea9f7b6ef73c76a618f35dd36df /arch/arc | |
| parent | e5ed6069b7d8a41e4de09e8edf783f6b1a83b48f (diff) | |
| download | linux-stable-feb92d7d3813456c11dce215b3421801a78a8986.tar.gz linux-stable-feb92d7d3813456c11dce215b3421801a78a8986.tar.bz2 linux-stable-feb92d7d3813456c11dce215b3421801a78a8986.zip | |
ARC: perf: don't bail setup if pct irq missing in device-tree
Current code inadventely bails if hardware supports sampling/overflow
interrupts, but the irq is missing from device tree.
|
| # perf stat -e cycles,instructions,major-faults,minor-faults ../hackbench
| Running with 10 groups 400 process
| Time: 0.921
|
| Performance counter stats for '../hackbench':
|
| <not supported> cycles
| <not supported> instructions
| 0 major-faults
| 8679 minor-faults
This need not be as we can still do simple counting based perf stat.
This unborks perf on HSDK-4xD
Cc: <stable@vger.kernel.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/kernel/perf_event.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c index 661fd842ea97..79849f37e782 100644 --- a/arch/arc/kernel/perf_event.c +++ b/arch/arc/kernel/perf_event.c @@ -562,7 +562,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev) { struct arc_reg_pct_build pct_bcr; struct arc_reg_cc_build cc_bcr; - int i, has_interrupts; + int i, has_interrupts, irq; int counter_size; /* in bits */ union cc_name { @@ -637,13 +637,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev) .attr_groups = arc_pmu->attr_groups, }; - if (has_interrupts) { - int irq = platform_get_irq(pdev, 0); - - if (irq < 0) { - pr_err("Cannot get IRQ number for the platform\n"); - return -ENODEV; - } + if (has_interrupts && (irq = platform_get_irq(pdev, 0) >= 0)) { arc_pmu->irq = irq; @@ -652,9 +646,9 @@ static int arc_pmu_device_probe(struct platform_device *pdev) this_cpu_ptr(&arc_pmu_cpu)); on_each_cpu(arc_cpu_pmu_irq_init, &irq, 1); - - } else + } else { arc_pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; + } /* * perf parser doesn't really like '-' symbol in events name, so let's |