linux-kernel - Re: [PATCH 3/8] shazptr: Add refscale test for wildcard

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Message-ID: <20250625100317.GC1613376@noisy.programming.kicks-ass.net>
Date: Wed, 25 Jun 2025 12:03:17 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org, lkmm@...ts.linux.dev,
	Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang@...ux.dev>, Breno Leitao <leitao@...ian.org>,
	aeh@...a.com, netdev@...r.kernel.org, edumazet@...gle.com,
	jhs@...atatu.com, kernel-team@...a.com,
	Erik Lundgren <elundgren@...a.com>
Subject: Re: [PATCH 3/8] shazptr: Add refscale test for wildcard

On Tue, Jun 24, 2025 at 08:10:56PM -0700, Boqun Feng wrote:

> +static void ref_shazptr_wc_read_section(const int nloops)
> +{
> +	int i;
> +
> +	for (i = nloops; i >= 0; i--) {
> +		preempt_disable();
> +		{
> +			guard(shazptr)(ref_shazptr_read_section);
> +			/* Trigger wildcard logic */
> +			guard(shazptr)(ref_shazptr_wc_read_section);
> +		}
> +		preempt_enable();
> +	}
> +}
> +
> +static void ref_shazptr_wc_delay_section(const int nloops, const int udl, const int ndl)
> +{
> +	int i;
> +
> +	for (i = nloops; i >= 0; i--) {
> +		preempt_disable();
> +		{
> +			guard(shazptr)(ref_shazptr_delay_section);
> +			/* Trigger wildcard logic */
> +			guard(shazptr)(ref_shazptr_wc_delay_section);
> +			un_delay(udl, ndl);
> +		}
> +		preempt_enable();
> +	}
> +}

Same as the last one, scoped_guard (preempt) can replace the preempt
things and the scope.