x86_pmu_handle_irq
handled = x86_pmu_handle_irq(regs);
ret = static_call(x86_pmu_handle_irq)(regs);
static_call_update(x86_pmu_handle_irq, x86_pmu.handle_irq);
DEFINE_STATIC_CALL_NULL(x86_pmu_handle_irq, *x86_pmu.handle_irq);
.handle_irq = x86_pmu_handle_irq,
.handle_irq = x86_pmu_handle_irq,
int x86_pmu_handle_irq(struct pt_regs *regs);