From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 2 Jan 2013 15:54:12 +0000 (+0100)
Subject: s390/irq: count cpu restart events
X-Git-Tag: upstream/snapshot3+hdmi~5902^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=93f3b2ee0abff5438e74cc90cf816429248cc8eb;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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>
---

diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
index c98dcac..7def773 100644
--- 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
index 5f54624..9df824e 100644
--- 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
index 4a36d5b..7433a2f 100644
--- 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();