ARM: 8450/1: v7-M: Use ret_to_user_from_irq in PendSV handler

The PendSV handler calls v7m_exception_entry which
disables IRQs. Therefore, since IRQs are already disabled,
the PendSV handler can return using ret_to_user_from_irq.
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/entry-v7m.S

@@ -88,7 +88,7 @@ __pendsv_entry:
 	@ execute the pending work, including reschedule
 	get_thread_info tsk
 	mov	why, #0
-	b	ret_to_user
+	b	ret_to_user_from_irq
 ENDPROC(__pendsv_entry)
 
 /*