On Wed, 27 Oct 2021 10:34:13 +0800
王贇 <yun.wang@xxxxxxxxxxxxxxxxx> wrote:
> +/*
> + * Preemption will be enabled (if it was previously enabled).
> + */
> static __always_inline void trace_clear_recursion(int bit)
> {
> + WARN_ON_ONCE(bit < 0);
Can you send a v7 without the WARN_ON.
This is an extremely hot path, and this will cause noticeable overhead.
If something were to call this with bit < 0, then it would crash and
burn rather quickly.
-- Steve
> +
> + preempt_enable_notrace();
> barrier();
> trace_recursion_clear(bit);
> }
