linux-kernel - [PATCH 5.5 054/189] csky: Fixup ftrace modify panic

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Date:   Tue, 10 Mar 2020 13:38:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 054/189] csky: Fixup ftrace modify panic

From: Guo Ren <guoren@...ux.alibaba.com>

[ Upstream commit 359ae00d12589c31cf103894d0f32588d523ca83 ]

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@...ux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/csky/mm/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/csky/mm/Makefile b/arch/csky/mm/Makefile
index c94ef64810986..efb7ebab342b3 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
-- 
2.20.1