From 359ae00d12589c31cf103894d0f32588d523ca83 Mon Sep 17 00:00:00 2001
From: Guo Ren <guoren@linux.alibaba.com>
Date: Sun, 2 Feb 2020 09:58:42 +0800
Subject: [PATCH] csky: Fixup ftrace modify panic

During ftrace init, linux will replace all function prologues
(call_mcout) with nops, but it need flush_dcache and
invalidate_icache to make it work. So flush_cache functions
couldn't be nested called by ftrace framework.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
---
 arch/csky/mm/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/csky/mm/Makefile b/arch/csky/mm/Makefile
index 2c51918eb4fc..6e7696e55f71 100644
--- a/arch/csky/mm/Makefile
+++ b/arch/csky/mm/Makefile
@@ -1,8 +1,10 @@
 # SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_CPU_HAS_CACHEV2),y)
 obj-y +=			cachev2.o
+CFLAGS_REMOVE_cachev2.o = $(CC_FLAGS_FTRACE)
 else
 obj-y +=			cachev1.o
+CFLAGS_REMOVE_cachev1.o = $(CC_FLAGS_FTRACE)
 endif
 
 obj-y +=			dma-mapping.o