netdev - Re: [PATCH 1/8] Introduce simple hazard pointers

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Message-ID: <3e2a80e6-b3c5-44dd-b290-1d140cc427ff@efficios.com>
Date: Wed, 25 Jun 2025 10:25:23 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org,
 rcu@...r.kernel.org, lkmm@...ts.linux.dev
Cc: Peter Zijlstra <peterz@...radead.org>, 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>, 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 1/8] Introduce simple hazard pointers

On 2025-06-24 23:10, Boqun Feng wrote:
[...]
> +
> +static inline void shazptr_clear(struct shazptr_guard guard)
> +{
> +	/* Only clear the slot when the outermost guard is released */
> +	if (likely(!guard.use_wildcard))
> +		smp_store_release(guard.slot, NULL); /* Pair with ACQUIRE at synchronize_shazptr() */

How is the wildcard ever cleared ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com