linux-kernel - [PATCH] MIPS: disable kcov instrumentation in compressed dir

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Message-Id: <20191210175002.981-1-efremov@linux.com>
Date:   Tue, 10 Dec 2019 20:50:02 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Ralf Baechle <ralf@...ux-mips.org>
Cc:     Denis Efremov <efremov@...ux.com>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] MIPS: disable kcov instrumentation in compressed dir

This patch fixes the compilation with CONFIG_KCOV enabled.
Otherwise linking fails with:
ld: arch/mips/boot/compressed/piggy.o: in function `main':
dummy.c:(.text.startup+0x8): undefined reference to `__sanitizer_cov_...'
make[1]: *** [arch/mips/boot/compressed/Makefile:101: vmlinuz] Error 1

Signed-off-by: Denis Efremov <efremov@...ux.com>
---
 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 172801ed35b8..d859f079b771 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -29,6 +29,9 @@ KBUILD_AFLAGS := $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
 	-DBOOT_HEAP_SIZE=$(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