Messages in this thread | | | Date | Thu, 31 Mar 2016 16:02:47 +0200 | Subject | Re: [PATCH v1] arm64: allow building with kcov coverage on ARM64 | From | Alexander Potapenko <> |
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On Thu, Mar 31, 2016 at 3:54 PM, Alexander Potapenko <glider@google.com> wrote: > Add ARCH_HAS_KCOV to ARM64 config. Disable instrumentation of > arch/arm64/lib/delay.c > > Signed-off-by: Alexander Potapenko <glider@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 >
Hi all,
I've ported the above patch from kernel 3.18, which I was able to successfully run with kcov support on an arm64 device. The original 3.18 patch is at https://chromium-review.googlesource.com/#/c/334560/1, it also touches arch/arm64/kernel/Makefile, which is unnecessary in upstream code, because efi-stub.c has been moved to libstub. Therefore I suspect the above patch should be correct, but I don't have an opportunity to actually test it.
Alex
-- Alexander Potapenko Software Engineer
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