add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/xtensa/kernel/smp.c
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@@ -53,16 +53,12 @@
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 #define IPI_IRQ	0
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 static irqreturn_t ipi_interrupt(int irq, void *dev_id);
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-static struct irqaction ipi_irqaction = {
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-	.handler =	ipi_interrupt,
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-	.flags =	IRQF_PERCPU,
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-	.name =		"ipi",
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-};
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 void ipi_init(void)
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 {
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 	unsigned irq = irq_create_mapping(NULL, IPI_IRQ);
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-	setup_irq(irq, &ipi_irqaction);
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+	if (request_irq(irq, ipi_interrupt, IRQF_PERCPU, "ipi", NULL))
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+		pr_err("Failed to request irq %u (ipi)\n", irq);
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 }
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 static inline unsigned int get_core_count(void)
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@@ -126,7 +122,7 @@
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 	init_mmu();
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-#ifdef CONFIG_DEBUG_KERNEL
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+#ifdef CONFIG_DEBUG_MISC
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 	if (boot_secondary_processors == 0) {
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 		pr_debug("%s: boot_secondary_processors:%d; Hanging cpu:%d\n",
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 			__func__, boot_secondary_processors, cpu);
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@@ -149,7 +145,6 @@
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 	cpumask_set_cpu(cpu, mm_cpumask(mm));
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 	enter_lazy_tlb(mm, current);
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-	preempt_disable();
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 	trace_hardirqs_off();
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 	calibrate_delay();
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@@ -372,8 +367,7 @@
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 	unsigned long mask = 0;
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 	for_each_cpu(index, callmask)
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-		if (index != smp_processor_id())
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-			mask |= 1 << index;
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+		mask |= 1 << index;
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 	set_er(mask, MIPISET(msg_id));
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 }
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@@ -412,22 +406,31 @@
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 {
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 	unsigned int cpu = smp_processor_id();
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 	struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
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-	unsigned int msg;
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-	unsigned i;
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-	msg = get_er(MIPICAUSE(cpu));
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-	for (i = 0; i < IPI_MAX; i++)
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-		if (msg & (1 << i)) {
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-			set_er(1 << i, MIPICAUSE(cpu));
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-			++ipi->ipi_count[i];
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+	for (;;) {
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+		unsigned int msg;
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+
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+		msg = get_er(MIPICAUSE(cpu));
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+		set_er(msg, MIPICAUSE(cpu));
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+
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+		if (!msg)
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+			break;
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+
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+		if (msg & (1 << IPI_CALL_FUNC)) {
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+			++ipi->ipi_count[IPI_CALL_FUNC];
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+			generic_smp_call_function_interrupt();
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 		}
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-	if (msg & (1 << IPI_RESCHEDULE))
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-		scheduler_ipi();
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-	if (msg & (1 << IPI_CALL_FUNC))
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-		generic_smp_call_function_interrupt();
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-	if (msg & (1 << IPI_CPU_STOP))
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-		ipi_cpu_stop(cpu);
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+		if (msg & (1 << IPI_RESCHEDULE)) {
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+			++ipi->ipi_count[IPI_RESCHEDULE];
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+			scheduler_ipi();
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+		}
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+
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+		if (msg & (1 << IPI_CPU_STOP)) {
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+			++ipi->ipi_count[IPI_CPU_STOP];
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+			ipi_cpu_stop(cpu);
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+		}
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+	}
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 	return IRQ_HANDLED;
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 }