From: Arnd Bergmann <arnd@arndb.de>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Subject: Re: [PATCH] asm-generic: add dma-mapping-linear.h
Date: Mon, 1 Jun 2009 11:48:34 +0100
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Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
       linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
References: <200905282104.55818.arnd@arndb.de> <200906011128.10670.arnd@arndb.de> <20090601104353.GA25391@flint.arm.linux.org.uk>
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On Monday 01 June 2009, Russell King wrote:
> 
> Err - there's only one highmem implementation on ARM.

Sorry for not being clear enough, I meant three implementations of
page_to_dma(), depending on highmem and platform:

	return (dma_addr_t)__virt_to_bus((unsigned long)page_address(page));
	return (dma_addr_t)__pfn_to_bus(page_to_pfn(page));
	return __arch_page_to_dma(dev, page);

The generic code right now does the first, which won't work with highmem
and also won't handle platform specific requirements that are not present
on the other architectures.

	Arnd <><
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