sh: Count NMIs in irq_cpustat_t.

This plugs in support for NMI counting per-CPU via irq_cpustat_t.
Modelled after the x86 implementation.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/hardirq.h

 #ifndef __ASM_SH_HARDIRQ_H
 #define __ASM_SH_HARDIRQ_H
 
-extern void ack_bad_irq(unsigned int irq);
-#define ack_bad_irq ack_bad_irq
+#include <linux/threads.h>
+#include <linux/irq.h>
+
+typedef struct {
+	unsigned int __softirq_pending;
+	unsigned int __nmi_count;		/* arch dependent */
+} ____cacheline_aligned irq_cpustat_t;
 
-#include <asm-generic/hardirq.h>
+#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
+
+extern void ack_bad_irq(unsigned int irq);
 
 #endif /* __ASM_SH_HARDIRQ_H */

arch/sh/kernel/irq.c

@@ -36,7 +36,15 @@ void ack_bad_irq(unsigned int irq)
  */
 static int show_other_interrupts(struct seq_file *p, int prec)
 {
+	int j;
+
+	seq_printf(p, "%*s: ", prec, "NMI");
+	for_each_online_cpu(j)
+		seq_printf(p, "%10u ", irq_stat[j].__nmi_count);
+	seq_printf(p, "  Non-maskable interrupts\n");
+
 	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
+
 	return 0;
 }
 

arch/sh/kernel/traps.c

@@ -95,9 +95,11 @@ BUILD_TRAP_HANDLER(bug)
 
 BUILD_TRAP_HANDLER(nmi)
 {
+	unsigned int cpu = smp_processor_id();
 	TRAP_HANDLER_DECL;
 
 	nmi_enter();
+	nmi_count(cpu)++;
 
 	switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
 	case NOTIFY_OK: