csky: Enable LOCKDEP_SUPPORT

Lockdep is needed by proving the spinlocks and rwlocks. Currently,
we only put trace_hardirqs_on/off with csky_irq and
ret_from_exception.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

arch/csky/Kconfig

@@ -69,6 +69,9 @@ config CSKY
 	select PCI_SYSCALL if PCI
 	select PCI_MSI if PCI
 
+config LOCKDEP_SUPPORT
+	def_bool y
+
 config CPU_HAS_CACHEV2
 	bool
 

arch/csky/kernel/entry.S

@@ -225,6 +225,13 @@ ret_from_exception:
 	cmpnei	r12, 0
 	bt	exit_work
 1:
+#ifdef CONFIG_TRACE_IRQFLAGS
+	ld	r10, (sp, LSAVE_PSR)
+	btsti	r10, 6
+	bf	2f
+	jbsr	trace_hardirqs_on
+2:
+#endif
 	RESTORE_ALL
 
 exit_work:
@@ -280,6 +287,10 @@ ENTRY(csky_irq)
 	zero_fp
 	psrset	ee
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+	jbsr	trace_hardirqs_off
+#endif
+
 #ifdef CONFIG_PREEMPTION
 	mov	r9, sp			/* Get current stack  pointer */
 	bmaski	r10, THREAD_SHIFT