linux-kernel - Re: [PATCH] asm-generic: add dma-mapping-linear.h

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Date:	Mon, 1 Jun 2009 11:48:34 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] asm-generic: add dma-mapping-linear.h

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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