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Date: Tue, 4 Jun 2024 15:45:05 +0200 From: Dmitry Vyukov <dvyukov@...gle.com> To: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org Cc: linux-kernel@...r.kernel.org, syzkaller@...glegroups.com, elver@...gle.com, glider@...gle.com, nogikh@...gle.com, tarasmadan@...gle.com, Dmitry Vyukov <dvyukov@...gle.com> Subject: [PATCH 4/4] x86: Ignore stack unwinding in KCOV Stack unwinding produces large amounts of uninteresting coverage. It's called from KASAN kmalloc/kfree hooks, fault injection, etc. It's not particularly useful and is not a function of system call args. Ignore that code. Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com> Cc: x86@...nel.org Cc: linux-kernel@...r.kernel.org Cc: syzkaller@...glegroups.com --- arch/x86/kernel/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 20a0dd51700a..cd49ebfae984 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -39,6 +39,14 @@ KMSAN_SANITIZE_sev.o := n # first second. KCOV_INSTRUMENT_head$(BITS).o := n KCOV_INSTRUMENT_sev.o := n +# These are called from save_stack_trace() on debug paths, +# and produce large amounts of uninteresting coverage. +KCOV_INSTRUMENT_stacktrace.o := n +KCOV_INSTRUMENT_dumpstack.o := n +KCOV_INSTRUMENT_dumpstack_$(BITS).o := n +KCOV_INSTRUMENT_unwind_orc.o := n +KCOV_INSTRUMENT_unwind_frame.o := n +KCOV_INSTRUMENT_unwind_guess.o := n CFLAGS_irq.o := -I $(src)/../include/asm/trace -- 2.45.1.467.gbab1589fc0-goog
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