s390/irq: count cpu restart events

Count CPU Restart events and make them visible via /proc/interrupts. Every CPU hotplug (online) event will increase the per cpu counter. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
mariux64 · Jan 8, 2013 · 93f3b2e · 93f3b2e
1 parent 420f42e
commit 93f3b2e
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diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
@@ -42,6 +42,7 @@ enum interruption_class {
 	IRQIO_PCI,
 	IRQIO_MSI,
 	NMI_NMI,
+	CPU_RST,
 	NR_ARCH_IRQS
 };
 

diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
@@ -82,6 +82,7 @@ static const struct irq_class irqclass_sub_desc[NR_ARCH_IRQS] = {
 	[IRQIO_PCI]  = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
 	[IRQIO_MSI]  = {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
 	[NMI_NMI]    = {.name = "NMI", .desc = "[NMI] Machine Check"},
+	[CPU_RST]    = {.name = "RST", .desc = "[CPU] CPU Restart"},
 };
 
 /*

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
@@ -709,6 +709,7 @@ static void __cpuinit smp_start_secondary(void *cpuvoid)
 	pfault_init();
 	notify_cpu_starting(smp_processor_id());
 	set_cpu_online(smp_processor_id(), true);
+	inc_irq_stat(CPU_RST);
 	local_irq_enable();
 	/* cpu_idle will call schedule for us */
 	cpu_idle();