linux-kernel - Re: [PATCH 4/7] mmc: at91_mci: use DMA buffer for read

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Message-Id: <20100302133434.761df661.akpm@linux-foundation.org>
Date:	Tue, 2 Mar 2010 13:34:34 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, wolfgang.mues@...rswald.de,
	avictor.za@...il.com
Subject: Re: [PATCH 4/7] mmc: at91_mci: use DMA buffer for read

On Fri, 26 Feb 2010 19:39:32 +0100
Nicolas Ferre <nicolas.ferre@...el.com> wrote:

> +		kunmap_atomic(((void *)sgbuffer)-sg->offset, KM_BIO_SRC_IRQ);

It's a feature of kunmap_atomic() that it will accept a pointer to any
location in the page.  So the subtraction isn't strictly needed.

And if the subtraction is removed, the (void*) cast can also be removed.

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