linux-kernel - Re: [tip:core/locking] locking/mutexes: Modify the way optimistic spinners are queued

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Message-ID: <1394551460.11149.6.camel@j-VirtualBox>
Date:	Tue, 11 Mar 2014 08:24:20 -0700
From:	Jason Low <jason.low2@...com>
To:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/locking] locking/mutexes: Modify the way optimistic
 spinners are queued

On Tue, 2014-03-11 at 05:41 -0700, tip-bot for Jason Low wrote:

> diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
> index e6d646b..82dad2c 100644
> --- a/kernel/locking/mutex.c
> +++ b/kernel/locking/mutex.c
> @@ -403,9 +403,9 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
>  	if (!mutex_can_spin_on_owner(lock))
>  		goto slowpath;
>  
> +	mcs_spin_lock(&lock->mcs_lock, &node);
>  	for (;;) {
>  		struct task_struct *owner;
> -		struct mcs_spinlock  node;

Hi Peter, Ingo,

The "struct mcs_spinlock node" still needs to be moved to the beginning
of __mutex_lock_common() right?

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