[PATCH v1] arm64: allow building with kcov coverage on ARM64

[Alexander Potapenko]

Add ARCH_HAS_KCOV to ARM64 config. Disable instrumentation of
arch/arm64/lib/delay.c

Signed-off-by: Alexander Potapenko <gli...@google.com>
---
 arch/arm64/Kconfig      | 1 +
 arch/arm64/lib/Makefile | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4f43622..c52aa61 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -7,6 +7,7 @@ config ARM64
        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
        select ARCH_HAS_ELF_RANDOMIZE
        select ARCH_HAS_GCOV_PROFILE_ALL
+       select ARCH_HAS_KCOV
        select ARCH_HAS_SG_CHAIN
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select ARCH_USE_CMPXCHG_LOCKREF
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
index c86b790..b407bc1 100644
--- a/arch/arm64/lib/Makefile
+++ b/arch/arm64/lib/Makefile
@@ -1,3 +1,6 @@
+# Produces uninteresting flaky coverage.
+KCOV_INSTRUMENT_delay.o        := n
+
 lib-y          := bitops.o clear_user.o delay.o copy_from_user.o       \
                   copy_to_user.o copy_in_user.o copy_page.o            \
                   clear_page.o memchr.o memcpy.o memmove.o memset.o    \
-- 
2.8.0.rc3.226.g39d4020