powerpc: Use MSR_64BIT in places

Use the new MSR_64BIT in a few places. Some of these are already ifdef'ed
for BOOKE vs BOOKS, but it's still clearer, MSR_SF does not immediately
parse as "MSR bit for 64bit".

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 27c4a45..da989ff 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -381,7 +381,7 @@
 	       regs, uc, &uc->uc_mcontext);
 #endif
 	if (show_unhandled_signals && printk_ratelimit())
-		printk(regs->msr & MSR_SF ? fmt64 : fmt32,
+		printk(regs->msr & MSR_64BIT ? fmt64 : fmt32,
 			current->comm, current->pid, "rt_sigreturn",
 			(long)uc, regs->nip, regs->link);
 
@@ -469,7 +469,7 @@
 	       regs, frame, newsp);
 #endif
 	if (show_unhandled_signals && printk_ratelimit())
-		printk(regs->msr & MSR_SF ? fmt64 : fmt32,
+		printk(regs->msr & MSR_64BIT ? fmt64 : fmt32,
 			current->comm, current->pid, "setup_rt_frame",
 			(long)frame, regs->nip, regs->link);