ARM: entry: no need to check parent IRQ mask in IRQ handler return

There's no point checking to see whether IRQs were masked in the parent
context when returning from IRQ handling - the fact that we're handling
an IRQ means that the parent context must have had IRQs unmasked.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/entry-armv.S

@@ -234,8 +234,9 @@ __irq_svc:
 #endif
 	ldr	r4, [sp, #S_PSR]		@ irqs are already disabled
 #ifdef CONFIG_TRACE_IRQFLAGS
-	tst	r4, #PSR_I_BIT
-	bleq	trace_hardirqs_on
+	@ The parent context IRQs must have been enabled to get here in
+	@ the first place, so there's no point checking the PSR I bit.
+	bl	trace_hardirqs_on
 #endif
 	svc_exit r4				@ return from exception
  UNWIND(.fnend		)