[SPARC]: dump_stack for sparc

Bob Breuer wrote a patch to add dump_stack for sparc. Supposedly, this
was applied, but it doesn't exist in 2.6.11.

This is the same patch, rediffed against 2.6.11.
Signed-off-by: Tom 'spot' Callaway <tcallawa@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/process.c

@@ -333,6 +333,17 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
 	printk("\n");
 }
 
+void dump_stack(void)
+{
+	unsigned long *ksp;
+
+	__asm__ __volatile__("mov	%%fp, %0"
+			     : "=r" (ksp));
+	show_stack(current, ksp);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
 /*
  * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
  */