netdev - Re: [PATCH 0/8] Introduce simple hazard pointers for lockdep

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Message-ID: <aF0eEfoWVCyoIAgx@infradead.org>
Date: Thu, 26 Jun 2025 03:16:49 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>, linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org, lkmm@...ts.linux.dev,
	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>,
	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 0/8] Introduce simple hazard pointers for lockdep

On Wed, Jun 25, 2025 at 07:08:57AM -0700, Boqun Feng wrote:
> Sure, I will put one for the future version, here is the gist:

Thanks a lot!

> The updater's wait can finish immediately if no one is accessing 'a', in
> other words it doesn't need to wait for reader 2.

So basically it is the RCU concept, but limited to protecting exactly
one pointer update per critical section with no ability for the read
to e.g. acquire a refcount on the objected pointed to by that pointer?