powerpc/64: Implement and use soft_enabled_return API

Add a new wrapper function, soft_enabled_return(), added to return
paca->soft_enabled value.
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/hw_irq.h

@@ -49,6 +49,18 @@ extern void unknown_exception(struct pt_regs *regs);
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
 
+static inline notrace unsigned long soft_enabled_return(void)
+{
+	unsigned long flags;
+
+	asm volatile(
+		"lbz %0,%1(13)"
+		: "=r" (flags)
+		: "i" (offsetof(struct paca_struct, soft_enabled)));
+
+	return flags;
+}
+
 /*
  * The "memory" clobber acts as both a compiler barrier
  * for the critical section and as a clobber because
@@ -66,14 +78,7 @@ static inline notrace void soft_enabled_set(unsigned long enable)
 
 static inline unsigned long arch_local_save_flags(void)
 {
-	unsigned long flags;
-
-	asm volatile(
-		"lbz %0,%1(13)"
-		: "=r" (flags)
-		: "i" (offsetof(struct paca_struct, soft_enabled)));
-
-	return flags;
+	return soft_enabled_return();
 }
 
 static inline void arch_local_irq_disable(void)

arch/powerpc/kernel/time.c

@@ -244,7 +244,7 @@ static u64 scan_dispatch_log(u64 stop_tb)
 void accumulate_stolen_time(void)
 {
 	u64 sst, ust;
-	u8 save_soft_enabled = local_paca->soft_enabled;
+	unsigned long save_soft_enabled = soft_enabled_return();
 	struct cpu_accounting_data *acct = &local_paca->accounting;
 
 	/* We are called early in the exception entry, before