linux-kernel - Re: [PATCH v2 1/5] tracing: Add support for creating hist trigger variables from literal

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Date:   Wed, 20 Oct 2021 11:32:34 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Kalesh Singh <kaleshsingh@...gle.com>
Cc:     surenb@...gle.com, hridya@...gle.com, namhyung@...nel.org,
        kernel-team@...roid.com, Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 1/5] tracing: Add support for creating hist trigger
 variables from literal

On Tue, 19 Oct 2021 18:31:38 -0700
Kalesh Singh <kaleshsingh@...gle.com> wrote:

> @@ -89,6 +91,8 @@ typedef u64 (*hist_field_fn_t) (struct hist_field *field,
>  #define HIST_FIELD_OPERANDS_MAX	2
>  #define HIST_FIELDS_MAX		(TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
>  #define HIST_ACTIONS_MAX	8
> +#define HIST_CONST_MAX		4

BTW, why is there a limit to the number of constants?

-- Steve

> +#define HIST_CONST_DIGITS_MAX	21
>