--- zzzz-none-000/linux-3.10.107/arch/arc/include/asm/mach_desc.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arc/include/asm/mach_desc.h	2021-02-04 17:41:59.000000000 +0000
@@ -23,11 +23,8 @@
  * @dt_compat:		Array of device tree 'compatible' strings
  * 			(XXX: although only 1st entry is looked at)
  * @init_early:		Very early callback [called from setup_arch()]
- * @init_irq:		setup external IRQ controllers [called from init_IRQ()]
- * @init_smp:		for each CPU (e.g. setup IPI)
+ * @init_per_cpu:	for each CPU as it is coming up (SMP as well as UP)
  * 			[(M):init_IRQ(), (o):start_kernel_secondary()]
- * @init_time:		platform specific clocksource/clockevent registration
- * 			[called from time_init()]
  * @init_machine:	arch initcall level callback (e.g. populate static
  * 			platform devices or parse Devicetree)
  * @init_late:		Late initcall level callback
@@ -36,13 +33,10 @@
 struct machine_desc {
 	const char		*name;
 	const char		**dt_compat;
-
 	void			(*init_early)(void);
-	void			(*init_irq)(void);
 #ifdef CONFIG_SMP
-	void			(*init_smp)(unsigned int);
+	void			(*init_per_cpu)(unsigned int);
 #endif
-	void			(*init_time)(void);
 	void			(*init_machine)(void);
 	void			(*init_late)(void);
 
@@ -51,22 +45,12 @@
 /*
  * Current machine - only accessible during boot.
  */
-extern struct machine_desc *machine_desc;
+extern const struct machine_desc *machine_desc;
 
 /*
  * Machine type table - also only accessible during boot
  */
-extern struct machine_desc __arch_info_begin[], __arch_info_end[];
-#define for_each_machine_desc(p)			\
-	for (p = __arch_info_begin; p < __arch_info_end; p++)
-
-static inline struct machine_desc *default_machine_desc(void)
-{
-	/* the default machine is the last one linked in */
-	if (__arch_info_end - 1 < __arch_info_begin)
-		return NULL;
-	return __arch_info_end - 1;
-}
+extern const struct machine_desc __arch_info_begin[], __arch_info_end[];
 
 /*
  * Set of macros to define architecture features.
@@ -81,7 +65,6 @@
 #define MACHINE_END				\
 };
 
-extern struct machine_desc *setup_machine_fdt(void *dt);
-extern void __init copy_devtree(void);
+extern const struct machine_desc *setup_machine_fdt(void *dt);
 
 #endif