x86: Replace ARCH_SETUP by a proper x86_init_ops

ARCH_SETUP is a horrible leftover from the old arch/i386 mach support
code. It still has a lonely user in xen. Move it to x86_init_ops.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/include/asm/paravirt.h

@@ -24,7 +24,6 @@ static inline void load_sp0(struct tss_struct *tss,
 	PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
 }
 
-#define ARCH_SETUP			pv_init_ops.arch_setup();
 static inline unsigned long get_wallclock(void)
 {
 	return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);

arch/x86/include/asm/paravirt_types.h

@@ -80,7 +80,6 @@ struct pv_init_ops {
 			  unsigned long addr, unsigned len);
 
 	/* Basic arch-specific setup */
-	void (*arch_setup)(void);
 	void (*post_allocator_init)(void);
 
 	/* Print a banner to identify the environment */

arch/x86/include/asm/x86_init.h

@@ -56,6 +56,14 @@ struct x86_init_irqs {
 	void (*trap_init)(void);
 };
 
+/**
+ * struct x86_init_oem - oem platform specific customizing functions
+ * @arch_setup:			platform specific architecure setup
+ */
+struct x86_init_oem {
+	void (*arch_setup)(void);
+};
+
 /**
  * struct x86_init_ops - functions for platform specific setup
  *
@@ -64,6 +72,7 @@ struct x86_init_ops {
 	struct x86_init_resources	resources;
 	struct x86_init_mpparse		mpparse;
 	struct x86_init_irqs		irqs;
+	struct x86_init_oem		oem;
 };
 
 extern struct x86_init_ops x86_init;

arch/x86/kernel/paravirt.c

@@ -311,7 +311,6 @@ struct pv_info pv_info = {
 struct pv_init_ops pv_init_ops = {
 	.patch = native_patch,
 	.banner = default_banner,
-	.arch_setup = paravirt_nop,
 };
 
 struct pv_time_ops pv_time_ops = {

arch/x86/kernel/setup.c

@@ -108,10 +108,6 @@
 #include <asm/numa_64.h>
 #endif
 
-#ifndef ARCH_SETUP
-#define ARCH_SETUP
-#endif
-
 /*
  * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
  * The direct mapping extends to max_pfn_mapped, so that we can directly access
@@ -750,7 +746,7 @@ void __init setup_arch(char **cmdline_p)
 	}
 #endif
 
-	ARCH_SETUP
+	x86_init.oem.arch_setup();
 
 	setup_memory_map();
 	parse_setup_data();

arch/x86/kernel/x86_init.c

@@ -42,4 +42,8 @@ struct __initdata x86_init_ops x86_init = {
 		.intr_init		= native_init_IRQ,
 		.trap_init		= x86_init_noop,
 	},
+
+	.oem = {
+		.arch_setup		= x86_init_noop,
+	},
 };

arch/x86/xen/enlighten.c

@@ -841,7 +841,6 @@ static const struct pv_init_ops xen_init_ops __initdata = {
 	.patch = xen_patch,
 
 	.banner = xen_banner,
-	.arch_setup = xen_arch_setup,
 	.post_allocator_init = xen_post_allocator_init,
 };
 
@@ -982,6 +981,7 @@ asmlinkage void __init xen_start_kernel(void)
 	pv_mmu_ops = xen_mmu_ops;
 
 	x86_init.resources.memory_setup = xen_memory_setup;
+	x86_init.oem.arch_setup = xen_arch_setup;
 
 #ifdef CONFIG_X86_64
 	/*