diff mbox series

[2/8] perf/arm-ccn: Use irq_set_affinity()

Message ID 20210518093118.128250213@linutronix.de (mailing list archive)
State New, archived
Headers show
Series genirq, perf: Cleanup the abuse of irq_set_affinity_hint() | expand

Commit Message

Thomas Gleixner May 18, 2021, 9:17 a.m. UTC
The driver uses irq_set_affinity_hint() to set the affinity for the PMU
interrupts, which relies on the undocumented side effect that this function
actually sets the affinity under the hood.

Setting an hint is clearly not a guarantee and for these PMU interrupts an
affinity hint, which is supposed to guide userspace for setting affinity,
is beyond pointless, because the affinity of these interrupts cannot be
modified from user space.

Aside of that the error checks are bogus because the only error which is
returned from irq_set_affinity_hint() is when there is no irq descriptor
for the interrupt number, but not when the affinity set fails. That's on
purpose because the hint can point to an offline CPU.

Replace the mindless abuse with irq_set_affinity().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/perf/arm-ccn.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
diff mbox series

Patch

--- a/drivers/perf/arm-ccn.c
+++ b/drivers/perf/arm-ccn.c
@@ -1211,7 +1211,7 @@  static int arm_ccn_pmu_offline_cpu(unsig
 	perf_pmu_migrate_context(&dt->pmu, cpu, target);
 	dt->cpu = target;
 	if (ccn->irq)
-		WARN_ON(irq_set_affinity_hint(ccn->irq, cpumask_of(dt->cpu)));
+		WARN_ON(irq_set_affinity(ccn->irq, cpumask_of(dt->cpu)));
 	return 0;
 }
 
@@ -1291,7 +1291,7 @@  static int arm_ccn_pmu_init(struct arm_c
 
 	/* Also make sure that the overflow interrupt is handled by this CPU */
 	if (ccn->irq) {
-		err = irq_set_affinity_hint(ccn->irq, cpumask_of(ccn->dt.cpu));
+		err = irq_set_affinity(ccn->irq, cpumask_of(ccn->dt.cpu));
 		if (err) {
 			dev_err(ccn->dev, "Failed to set interrupt affinity!\n");
 			goto error_set_affinity;
@@ -1325,8 +1325,6 @@  static void arm_ccn_pmu_cleanup(struct a
 
 	cpuhp_state_remove_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,
 					    &ccn->dt.node);
-	if (ccn->irq)
-		irq_set_affinity_hint(ccn->irq, NULL);
 	for (i = 0; i < ccn->num_xps; i++)
 		writel(0, ccn->xp[i].base + CCN_XP_DT_CONTROL);
 	writel(0, ccn->dt.base + CCN_DT_PMCR);