linux-kernel - [PATCH 4.9 46/97] MIPS: Prevent link failure with kcov instrumentation

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Date:   Wed, 22 Jan 2020 10:28:50 +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, Jouni Hogander <jouni.hogander@...kie.com>,
        Paul Burton <paulburton@...nel.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        linux-mips@...r.kernel.org, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 46/97] MIPS: Prevent link failure with kcov instrumentation

From: Jouni Hogander <jouni.hogander@...kie.com>

[ Upstream commit a4a3893114a41e365274d5fab5d9ff5acc235ff0 ]

__sanitizer_cov_trace_pc() is not linked in and causing link
failure if KCOV_INSTRUMENT is enabled. Fix this by disabling
instrumentation for compressed image.

Signed-off-by: Jouni Hogander <jouni.hogander@...kie.com>
Signed-off-by: Paul Burton <paulburton@...nel.org>
Cc: Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc: linux-mips@...r.kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/boot/compressed/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index ad31c76c7a29..2f77e250b91d 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -29,6 +29,9 @@ KBUILD_AFLAGS := $(LINUXINCLUDE) $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
 	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
 	-DKERNEL_ENTRY=$(VMLINUX_ENTRY_ADDRESS)
 
+# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
+KCOV_INSTRUMENT		:= n
+
 # decompressor objects (linked with vmlinuz)
 vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o
 
-- 
2.20.1