powerpc: Rename __get_SP() to current_stack_pointer()

Michael points out that __get_SP() is a pretty horrible
function name. Let's give it a better name.

Signed-off-by: Anton Blanchard <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/include/asm/perf_event.h

···
 	do {							\
 		(regs)->result = 0;				\
 		(regs)->nip = __ip;				\
-		(regs)->gpr[1] = __get_SP();			\
+		(regs)->gpr[1] = current_stack_pointer();	\
 		asm volatile("mfmsr %0" : "=r" ((regs)->msr));	\
 	} while (0)
 #endif

arch/powerpc/include/asm/reg.h

···
 
 #define proc_trap()	asm volatile("trap")
 
-extern unsigned long __get_SP(void);
+extern unsigned long current_stack_pointer(void);
 
 extern unsigned long scom970_read(unsigned int address);
 extern void scom970_write(unsigned int address, unsigned long value);

arch/powerpc/kernel/irq.c

···
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
 	long sp;
 
-	sp = __get_SP() & (THREAD_SIZE-1);
+	sp = current_stack_pointer() & (THREAD_SIZE-1);
 
 	/* check for stack overflow: is there less than 2KB free? */
 	if (unlikely(sp < (sizeof(struct thread_info) + 2048))) {

arch/powerpc/kernel/misc.S

···
 	mr	r3,r4
 	blr
 
-_GLOBAL(__get_SP)
+_GLOBAL(current_stack_pointer)
 	PPC_LL	r3,0(r1)
 	blr

arch/powerpc/kernel/ppc_ksyms.c

···
 EXPORT_SYMBOL(epapr_hypercall_start);
 #endif
 
-EXPORT_SYMBOL(__get_SP);
+EXPORT_SYMBOL(current_stack_pointer);

arch/powerpc/kernel/process.c

···
 		tsk = current;
 	if (sp == 0) {
 		if (tsk == current)
-			sp = __get_SP();
+			sp = current_stack_pointer();
 		else
 			sp = tsk->thread.ksp;
 	}

arch/powerpc/kernel/stacktrace.c

···
 {
 	unsigned long sp;
 
-	sp = __get_SP();
+	sp = current_stack_pointer();
 
 	save_context_stack(trace, sp, current, 1);
 }