linux-kernel - Re: [PATCH 2/2] locking/pvqspinlock: Use try_cmpxchg() in qspinlock

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Message-ID: <Zhfkinpp92Ja6Orl@gmail.com>
Date: Thu, 11 Apr 2024 15:24:26 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Uros Bizjak <ubizjak@...il.com>
Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>, Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH 2/2] locking/pvqspinlock: Use try_cmpxchg() in
 qspinlock_paravirt.h


* Uros Bizjak <ubizjak@...il.com> wrote:

> -	locked = cmpxchg_release(&lock->locked, _Q_LOCKED_VAL, 0);
> -	if (likely(locked == _Q_LOCKED_VAL))
> +	if (try_cmpxchg_release(&lock->locked, &locked, 0);
>  		return;                                   ^------------ ???

This doesn't appear to be a particularly well-tested patch. ;-)

Thanks,

	Ingo