From ba4489fb949cbd9c9b877dceae361129ed6280f1 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 18 May 2021 11:17:32 +0200 Subject: perf/imx_ddr: Use irq_set_affinity() 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 Cc: Frank Li Cc: Will Deacon Cc: Mark Rutland Cc: Shawn Guo Cc: Sascha Hauer Cc: Pengutronix Kernel Team Cc: Fabio Estevam Cc: NXP Linux Team Cc: linux-arm-kernel@lists.infradead.org Acked-by: Mark Rutland Link: https://lore.kernel.org/r/20210518093118.699566062@linutronix.de Signed-off-by: Will Deacon --- drivers/perf/fsl_imx8_ddr_perf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'drivers/perf') diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c index 2bbb93188064..df048fe42fc2 100644 --- a/drivers/perf/fsl_imx8_ddr_perf.c +++ b/drivers/perf/fsl_imx8_ddr_perf.c @@ -674,7 +674,7 @@ static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node) perf_pmu_migrate_context(&pmu->pmu, cpu, target); pmu->cpu = target; - WARN_ON(irq_set_affinity_hint(pmu->irq, cpumask_of(pmu->cpu))); + WARN_ON(irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu))); return 0; } @@ -749,7 +749,7 @@ static int ddr_perf_probe(struct platform_device *pdev) } pmu->irq = irq; - ret = irq_set_affinity_hint(pmu->irq, cpumask_of(pmu->cpu)); + ret = irq_set_affinity(pmu->irq, cpumask_of(pmu->cpu)); if (ret) { dev_err(pmu->dev, "Failed to set interrupt affinity!\n"); goto ddr_perf_err; @@ -777,7 +777,6 @@ static int ddr_perf_remove(struct platform_device *pdev) cpuhp_state_remove_instance_nocalls(pmu->cpuhp_state, &pmu->node); cpuhp_remove_multi_state(pmu->cpuhp_state); - irq_set_affinity_hint(pmu->irq, NULL); perf_pmu_unregister(&pmu->pmu); -- cgit