asm-generic/irqstat: Add optional __nmi_count member

Add an optional __nmi_count member to irq_cpustat_t so more architectures
can use the generic version.

Signed-off-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Frederic Weisbecker <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

include/asm-generic/hardirq.h

···
 
 typedef struct {
 	unsigned int __softirq_pending;
+#ifdef ARCH_WANTS_NMI_IRQSTAT
+	unsigned int __nmi_count;
+#endif
 } ____cacheline_aligned irq_cpustat_t;
 
 #include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */