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x86: Ignore stack unwinding in KCOV

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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@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/eaf54b8634970b73552dcd38bf9be6ef55238c10.1718092070.git.dvyukov@google.com
This commit is contained in:
Dmitry Vyukov 2024-06-11 09:50:33 +02:00 committed by Thomas Gleixner
parent f34d086fb7
commit ae94b263f5
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/Makefile
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@ -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