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

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To: Boqun Feng <boqun.feng@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, rcu@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, lkmm@xxxxxxxxxxxxxxx
Subject: Re: [RFC PATCH 1/4] hazptr: Add initial implementation of hazard pointers
From: Jonas Oberhauser <jonas.oberhauser@xxxxxxxxxxxxxxx>
Date: Thu, 19 Sep 2024 16:00:22 +0200
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>, Frederic Weisbecker <frederic@xxxxxxxxxx>, Neeraj Upadhyay <neeraj.upadhyay@xxxxxxxxxx>, Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>, Josh Triplett <josh@xxxxxxxxxxxxxxxx>, Uladzislau Rezki <urezki@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Lai Jiangshan <jiangshanlai@xxxxxxxxx>, Zqiang <qiang.zhang1211@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Waiman Long <longman@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Kent Overstreet <kent.overstreet@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, maged.michael@xxxxxxxxx, Neeraj Upadhyay <neeraj.upadhyay@xxxxxxx>
In-reply-to: <20240917143402.930114-2-boqun.feng@gmail.com>
References: <20240917143402.930114-1-boqun.feng@gmail.com> <20240917143402.930114-2-boqun.feng@gmail.com>
User-agent: Mozilla Thunderbird



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

References:
- [RFC PATCH 0/4] Add hazard pointers to kernel
  - From: Boqun Feng
- [RFC PATCH 1/4] hazptr: Add initial implementation of hazard pointers
  - From: Boqun Feng

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