linux-kernel - Re: [PATCH next v2 1/5] locking/osq_lock: Defer clearing node->locked until the slow osq

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Message-ID: <ZZPcQu9WsMdMi9d1@gmail.com>
Date: Tue, 2 Jan 2024 10:49:54 +0100
From: Ingo Molnar <mingo@...nel.org>
To: David Laight <David.Laight@...lab.com>
Cc: "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'peterz@...radead.org'" <peterz@...radead.org>,
	"'longman@...hat.com'" <longman@...hat.com>,
	"'mingo@...hat.com'" <mingo@...hat.com>,
	"'will@...nel.org'" <will@...nel.org>,
	"'boqun.feng@...il.com'" <boqun.feng@...il.com>,
	'Linus Torvalds' <torvalds@...ux-foundation.org>,
	"'virtualization@...ts.linux-foundation.org'" <virtualization@...ts.linux-foundation.org>,
	'Zeng Heng' <zengheng4@...wei.com>
Subject: Re: [PATCH next v2 1/5] locking/osq_lock: Defer clearing
 node->locked until the slow osq_lock() path.


* David Laight <David.Laight@...LAB.COM> wrote:

> Since node->locked cannot be set before the assignment to prev->next
> it is save to clear it in the slow path.

s/save
 /safe

Thanks,

	Ingo