sparc64: Fix sparse warnings in global reg snapshotting.

Lots of shadowed local variables and global_reg_snapshot[] needs
an extern declaration in asm/ptrace_64.h.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/ptrace_64.h

@@ -113,6 +113,8 @@ struct sparc_trapf {
 
 #ifdef __KERNEL__
 
+#include <linux/threads.h>
+
 static inline int pt_regs_trap_type(struct pt_regs *regs)
 {
 	return regs->magic & 0x1ff;
@@ -138,6 +140,7 @@ struct global_reg_snapshot {
 	struct thread_info	*thread;
 	unsigned long		pad1;
 };
+extern struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
 
 #define __ARCH_WANT_COMPAT_SYS_PTRACE
 

arch/sparc64/kernel/process.c

@@ -215,7 +215,6 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
 	global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
 
 	if (regs->tstate & TSTATE_PRIV) {
-		struct thread_info *tp = current_thread_info();
 		struct reg_window *rw;
 
 		rw = (struct reg_window *)
@@ -271,7 +270,6 @@ void __trigger_all_cpu_backtrace(void)
 
 	for_each_online_cpu(cpu) {
 		struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
-		struct thread_info *tp;
 
 		__global_reg_poll(gp);