The following commit has been merged into the x86/build branch of tip: Commit-ID: ae94b263f5f69c180347e795fbefa051b65aacc3 Gitweb: https://git.kernel.org/tip/ae94b263f5f69c180347e795fbefa051b65aacc3 Author: Dmitry Vyukov <dvyukov@xxxxxxxxxx> AuthorDate: Tue, 11 Jun 2024 09:50:33 +02:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Thu, 08 Aug 2024 17:36:35 +02:00 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@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx> Reviewed-by: Marco Elver <elver@xxxxxxxxxx> Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lore.kernel.org/all/eaf54b8634970b73552dcd38bf9be6ef55238c10.1718092070.git.dvyukov@xxxxxxxxxx --- arch/x86/kernel/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index a847180..f791898 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -35,6 +35,14 @@ KMSAN_SANITIZE_nmi.o := n # If instrumentation of the following files is enabled, boot hangs during # first second. KCOV_INSTRUMENT_head$(BITS).o := n +# These are called from save_stack_trace() on debug paths, +# and produce large amounts of uninteresting coverage. +KCOV_INSTRUMENT_stacktrace.o := n +KCOV_INSTRUMENT_dumpstack.o := n +KCOV_INSTRUMENT_dumpstack_$(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
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