MIPS: Get rid of 'kgdb_early_setup' cruft.

Commit 854700115ecf ([MIPS] kgdb: add arch support for the kernel's kgdb core)
added the 'kgdb_early_setup' flag to avoid  calling trap_init() and init_IRQ()
the second time, however the code that called these functions earlier,  from
kgdb_arch_init(), had been already removed by that  time,  so the flag never
served any useful purpose. Remove the related code along with ugly #ifdef'ery
at last.

[ralf@linux-mips.org: Folded in Guenter Roeck's fix.]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Patchwork: https://patchwork.linux-mips.org/patch/10501/Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Patchwork: https://patchwork.linux-mips.org/patch/10533/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/kgdb.h

@@ -33,7 +33,6 @@
 #define CACHE_FLUSH_IS_SAFE	0
 
 extern void arch_kgdb_breakpoint(void);
-extern int kgdb_early_setup;
 extern void *saved_vectors[32];
 extern void handle_exception(struct pt_regs *regs);
 extern void breakinst(void);

arch/mips/kernel/irq.c

@@ -25,10 +25,6 @@
 #include <linux/atomic.h>
 #include <asm/uaccess.h>
 
-#ifdef CONFIG_KGDB
-int kgdb_early_setup;
-#endif
-
 static DECLARE_BITMAP(irq_map, NR_IRQS);
 
 int allocate_irqno(void)
@@ -93,20 +89,10 @@ void __init init_IRQ(void)
 {
 	int i;
 
-#ifdef CONFIG_KGDB
-	if (kgdb_early_setup)
-		return;
-#endif
-
 	for (i = 0; i < NR_IRQS; i++)
 		irq_set_noprobe(i);
 
 	arch_init_irq();
-
-#ifdef CONFIG_KGDB
-	if (!kgdb_early_setup)
-		kgdb_early_setup = 1;
-#endif
 }
 
 #ifdef CONFIG_DEBUG_STACKOVERFLOW

arch/mips/kernel/kgdb.c

@@ -378,10 +378,6 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
 
 struct kgdb_arch arch_kgdb_ops;
 
-/*
- * We use kgdb_early_setup so that functions we need to call now don't
- * cause trouble when called again later.
- */
 int kgdb_arch_init(void)
 {
 	union mips_instruction insn = {

arch/mips/kernel/traps.c

@@ -2185,11 +2185,6 @@ void __init trap_init(void)
 
 	check_wait();
 
-#if defined(CONFIG_KGDB)
-	if (kgdb_early_setup)
-		return; /* Already done */
-#endif
-
 	if (cpu_has_veic || cpu_has_vint) {
 		unsigned long size = 0x200 + VECTORSPACING*64;
 		ebase = (unsigned long)