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perf/arm-cmn: Initialise cmn->cpu earlier

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commit 597704e201068db3d104de3c7a4d447ff8209127 upstream.

For all the complexity of handling affinity for CPU hotplug, what we've
apparently managed to overlook is that arm_cmn_init_irqs() has in fact
always been setting the *initial* affinity of all IRQs to CPU 0, not the
CPU we subsequently choose for event scheduling. Oh dear.

Cc: stable@vger.kernel.org
Fixes: 0ba64770a2 ("perf: Add Arm CMN-600 PMU driver")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Link: https://lore.kernel.org/r/b12fccba6b5b4d2674944f59e4daad91cd63420b.1747069914.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Murphy
2025-05-12 18:11:54 +01:00
committed by Greg Kroah-Hartman
parent 10778e2f49
commit 0ec1e98bf5
1 changed files with 1 additions and 1 deletions
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2
drivers/perf/arm-cmn.c
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@@ -2443,6 +2443,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
cmn->dev = &pdev->dev;
cmn->part = (unsigned long)device_get_match_data(cmn->dev);
cmn->cpu = cpumask_local_spread(0, dev_to_node(cmn->dev));
platform_set_drvdata(pdev, cmn);
if (cmn->part == PART_CMN600 && has_acpi_companion(cmn->dev)) {
@@ -2470,7 +2471,6 @@ static int arm_cmn_probe(struct platform_device *pdev)
if (err)
return err;
cmn->cpu = cpumask_local_spread(0, dev_to_node(cmn->dev));
cmn->pmu = (struct pmu) {
.module = THIS_MODULE,
.attr_groups = arm_cmn_attr_groups,