ARM: irqstat: Get rid of duplicated declaration

irq_cpustat_t is exactly the same as the asm-generic one. Define
ack_bad_irq so the generic header does not emit the generic version of it.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NFrederic Weisbecker <frederic@kernel.org>
Reviewed-by: NValentin Schneider <valentin.schneider@arm.com>
Link: https://lore.kernel.org/r/20201113141733.276505871@linutronix.de

arch/arm/include/asm/hardirq.h

@@ -2,16 +2,11 @@
 #ifndef __ASM_HARDIRQ_H
 #define __ASM_HARDIRQ_H
 
-#include <linux/cache.h>
-#include <linux/threads.h>
 #include <asm/irq.h>
 
-typedef struct {
-	unsigned int __softirq_pending;
-} ____cacheline_aligned irq_cpustat_t;
-
-#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
-
 #define __ARCH_IRQ_EXIT_IRQS_DISABLED	1
+#define ack_bad_irq ack_bad_irq
+
+#include <asm-generic/hardirq.h>
 
 #endif /* __ASM_HARDIRQ_H */

arch/arm/include/asm/irq.h

@@ -31,6 +31,8 @@ void handle_IRQ(unsigned int, struct pt_regs *);
 void init_IRQ(void);
 
 #ifdef CONFIG_SMP
+#include <linux/cpumask.h>
+
 extern void arch_trigger_cpumask_backtrace(const cpumask_t *mask,
 					   bool exclude_self);
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace