While we build the LL/SC atomics as a C object file, this does not follow the AAPCS. This does not interoperate with other C code, and can only be called from special wrapper assembly. Bulding a kernel with CONFIG_KCOV and CONFIG_ARM64_LSE_ATOMICS results in the cmopiler inserting calls to __sanitizer_cov_trace_pc within the LL/SC atomics. As __sanitizer_cov_trace_pc is built per the AAPCS, these calls corrupt register values, resulting in failures at boot time. Avoid this (and other similar issues) by opting out of all compiler instrumentation. We can opt-in to specific instrumentation in future if we want to. Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> --- arch/arm64/lib/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index a0abc142c92b..af77516f71b2 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -17,5 +17,6 @@ CFLAGS_atomic_ll_sc.o := -fcall-used-x0 -ffixed-x1 -ffixed-x2 \ -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \ -fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15 \ -fcall-saved-x18 +CC_INSTRUMENT_atomic_ll_sc.o := n lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
