Re: [PATCH] tracing: disable kcov on trace_preemptirq.c

[Dmitry Vyukov]

On Mon, 23 May 2022 at 08:30, Congyu Liu <liu3101@xxxxxxxxxx> wrote:
>
> Functions in trace_preemptirq.c could be invoked from early interrupt
> code that bypasses kcov trace function's in_task() check. Disable kcov
> on this file to reduce random code coverage.
>
> Signed-off-by: Congyu Liu <liu3101@xxxxxxxxxx>

Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>

> ---
>  kernel/trace/Makefile | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> index d77cd8032213..0d261774d6f3 100644
> --- a/kernel/trace/Makefile
> +++ b/kernel/trace/Makefile
> @@ -31,6 +31,10 @@ ifdef CONFIG_GCOV_PROFILE_FTRACE
>  GCOV_PROFILE := y
>  endif
>
> +# Functions in this file could be invoked from early interrupt
> +# code and produce random code coverage.
> +KCOV_INSTRUMENT_trace_preemptirq.o := n
> +
>  CFLAGS_bpf_trace.o := -I$(src)
>
>  CFLAGS_trace_benchmark.o := -I$(src)
> --
> 2.34.1
>