linux-kernel - Re: [TIP][RFC 2/7] futex: futex_top

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Message-ID: <alpine.LFD.2.00.0903071612000.29264@localhost.localdomain>
Date:	Sat, 7 Mar 2009 16:16:18 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Darren Hart <dvhltc@...ibm.com>
cc:	"lkml, " <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Sripathi Kodi <sripathik@...ibm.com>,
	John Stultz <johnstul@...ux.vnet.ibm.com>
Subject: Re: [TIP][RFC 2/7] futex: futex_top_waiter()

On Mon, 2 Mar 2009, Darren Hart wrote:

> From: Darren Hart <dvhltc@...ibm.com>
> 
> Improve legibility by wrapping finding the top waiter in a function.  This
> will be used by the follow-on patches for enabling requeue pi.
> +static struct futex_q *futex_top_waiter(struct futex_hash_bucket *hb,
> +					union futex_key *key)

Can we just have *head as argument instead of *hb ?

> +{
> +	struct plist_head *head;
> +	struct futex_q *this;
> +	struct futex_q *top_waiter = NULL;

  	struct futex_q *this;

> +	head = &hb->chain;
> +	plist_for_each_entry(this, head, list) {
> +		if (match_futex(&this->key, key)) {
  		   	return this;		    

> +			top_waiter = this;
> +			break;
> +		}
> +	}
> +	return top_waiter;

  	return NULL;

Makes the function half the size.

Thanks,

	tglx
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