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Date: Wed, 08 May 2002 14:30:36 -0700
From: Andrew Morton <akpm@zip.com.au>
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To: Pavel Machek <pavel@ucw.cz>, kernel list <linux-kernel@vger.kernel.org>
Subject: Re: Reading page from given block device
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Andrew Morton wrote:
> 
> ..
> >         memcpy(buf, bh->b_data, PAGE_SIZE);
> 
> You'll need to kmap bh->b_page before copying the data.

No you won't.  blockdev mappings don't use highmem.

-