linux-kernel - Re: [RFC PATCH 1/4] hazptr: Add initial implementation of hazard pointers

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Message-ID: <c62dd332-a8fe-4e9b-8bf8-8d1e6db052a7@huaweicloud.com>
Date: Thu, 19 Sep 2024 16:00:22 +0200
From: Jonas Oberhauser <jonas.oberhauser@...weicloud.com>
To: Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org,
 rcu@...r.kernel.org, linux-mm@...ck.org, lkmm@...r.kernel.org
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
 Frederic Weisbecker <frederic@...nel.org>,
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
 Joel Fernandes <joel@...lfernandes.org>,
 Josh Triplett <josh@...htriplett.org>, Uladzislau Rezki <urezki@...il.com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
 Mark Rutland <mark.rutland@....com>, Thomas Gleixner <tglx@...utronix.de>,
 Kent Overstreet <kent.overstreet@...il.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Vlastimil Babka <vbabka@...e.cz>, maged.michael@...il.com,
 Neeraj Upadhyay <neeraj.upadhyay@....com>
Subject: Re: [RFC PATCH 1/4] hazptr: Add initial implementation of hazard
 pointers

Am 9/17/2024 um 4:33 PM schrieb Boqun Feng:
> +#define hazptr_protect(hzp, gp, field) ({				\
> +	typeof(gp) ___p;						\
> +									\
> +	___p = hazptr_tryprotect(hzp, gp, field);			\
> +	BUG_ON(!___p);							\
> +	___p;								\
> +})

Hi Boqun, why crash instead of retry?

jonas