linux-kernel - ioremap definition in generic io.h

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Date:	Wed, 29 Sep 2010 09:59:05 +0200
From:	Jonas Bonn <jonas@...thpole.se>
To:	linux-kernel@...r.kernel.org
Subject: ioremap definition in generic io.h

Hi,

I'm wondering about the usefulness of the definition of ioremap and
__ioremap in asm-generic/io.h.  How is this intended to be used?  How
are the page tables for this mapping supposed to be constructed?

The definition is as follows:

/*
 * Change "struct page" to physical address.
 */
static inline void __iomem *ioremap(phys_addr_t offset, unsigned long
size)
{
        return (void __iomem*) (unsigned long)offset;
}

#define __ioremap(offset, size, flags)  ioremap(offset, size)

Regards,
Jonas




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