linux-kernel - Re: [PATCH v3] clocksource: Scale the max retry number of watchdog read according to CPU numbers

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Date: Mon, 19 Feb 2024 12:32:05 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Feng Tang <feng.tang@...el.com>, John Stultz <jstultz@...gle.com>,
 Stephen Boyd <sboyd@...nel.org>, paulmck@...nel.org, Waiman Long
 <longman@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 linux-kernel@...r.kernel.org
Cc: Feng Tang <feng.tang@...el.com>, Jin Wang <jin1.wang@...el.com>
Subject: Re: [PATCH v3] clocksource: Scale the max retry number of watchdog
 read according to CPU numbers

On Mon, Jan 29 2024 at 21:45, Feng Tang wrote:
> +static inline long clocksource_max_watchdog_read_retries(void)
> +{
> +	long max_retries = max_cswd_read_retries;
> +
> +	if (max_cswd_read_retries <= 0) {
> +		/* santity check for user input value */
> +		if (max_cswd_read_retries != -1)
> +			pr_warn_once("max_cswd_read_retries was set with an invalid number: %ld\n",
> +				max_cswd_read_retries);
> +
> +		max_retries = ilog2(num_online_cpus()) + 1;

I'm getting tired of these knobs and the horrors behind them. Why not
simply doing the obvious:

       retries = ilog2(num_online_cpus()) + 1;

and remove the knob alltogether?

Thanks,

        tglx