Re: [PATCH bpf-next v3] bpf: Change value of MAX_TAIL_CALL_CNT from 32 to 33

[Daniel Borkmann]

On 10/29/21 1:53 PM, Tiezhu Yang wrote:
[...]
> diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
> index b6c72af..6d10292 100644
> --- a/kernel/bpf/core.c
> +++ b/kernel/bpf/core.c
> @@ -1565,7 +1565,8 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn)
>   
>   		if (unlikely(index >= array->map.max_entries))
>   			goto out;
> -		if (unlikely(tail_call_cnt > MAX_TAIL_CALL_CNT))
> +
> +		if (unlikely(tail_call_cnt == MAX_TAIL_CALL_CNT))
>   			goto out;
>   

Why making it less robust by going with == rather than >= ?