void handle_IPI()

in kernel/smp.c [131:179]

• 37 lines of code
• 8 McCabe index (conditional complexity)

void handle_IPI(struct pt_regs *regs)
{
	unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
	unsigned long *stats = ipi_data[smp_processor_id()].stats;

	riscv_clear_ipi();

	while (true) {
		unsigned long ops;

		/* Order bit clearing and data access. */
		mb();

		ops = xchg(pending_ipis, 0);
		if (ops == 0)
			return;

		if (ops & (1 << IPI_RESCHEDULE)) {
			stats[IPI_RESCHEDULE]++;
			scheduler_ipi();
		}

		if (ops & (1 << IPI_CALL_FUNC)) {
			stats[IPI_CALL_FUNC]++;
			generic_smp_call_function_interrupt();
		}

		if (ops & (1 << IPI_CPU_STOP)) {
			stats[IPI_CPU_STOP]++;
			ipi_stop();
		}

		if (ops & (1 << IPI_IRQ_WORK)) {
			stats[IPI_IRQ_WORK]++;
			irq_work_run();
		}

#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
		if (ops & (1 << IPI_TIMER)) {
			stats[IPI_TIMER]++;
			tick_receive_broadcast();
		}
#endif
		BUG_ON((ops >> IPI_MAX) != 0);

		/* Order data access and bit testing. */
		mb();
	}
}