linux-kernel - Re: [RFC PATCH 5/5] locking/rwsem: Remove reader optimistic spinning

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Message-ID: <20201120144232.GE3040@hirez.programming.kicks-ass.net>
Date:   Fri, 20 Nov 2020 15:42:32 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [RFC PATCH 5/5] locking/rwsem: Remove reader optimistic spinning

On Tue, Nov 17, 2020 at 10:04:29PM -0500, Waiman Long wrote:
> -static inline bool osq_is_empty(struct rw_semaphore *sem)
> -{
> -	return !osq_is_locked(&sem->osq);

> -static inline bool osq_is_empty(sem)
> -{
> -	return false;
> -}

Oh, it doesn't live...