linux-kernel - RE: [PATCH v3 06/10] net/macb: clean up ring buffer logic

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B7081@saturn3.aculab.com>
Date:	Wed, 31 Oct 2012 09:48:09 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Nicolas Ferre" <nicolas.ferre@...el.com>,
	Håvard Skinnemoen <havard@...nnemoen.net>
Cc:	<netdev@...r.kernel.org>, <manabian@...il.com>,
	<patrice.vilchez@...el.com>, <linux-kernel@...r.kernel.org>,
	<bhutchings@...arflare.com>, <plagnioj@...osoft.com>,
	<davem@...emloft.net>, <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 06/10] net/macb: clean up ring buffer logic

> 	return (TX_RING_SIZE - (bp->tx_head - bp->tx_tail) & (TX_RING_SIZE - 1));

Is equivalent to:

	return (bp->tx_tail - bp->tx_head) & (TX_RING_SIZE - 1));

	David



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