linux-kernel - Re: [PATCH] tile,mn10300: add device parameter to dma_cache

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Date:	Tue, 5 Apr 2011 02:50:40 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	james@...anarts.com
Cc:	dhowells@...hat.com, yasutake.koichi@...panasonic.com,
	cmetcalf@...era.com, akpm@...ux-foundation.org,
	fujita.tomonori@....ntt.co.jp, james.hogan@...tec.com,
	konrad.wilk@...cle.com, lethal@...ux-sh.org, arnd@...db.de,
	linux-am33-list@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tile,mn10300: add device parameter to dma_cache_sync()

On Mon, 4 Apr 2011 16:21:47 +0100
James Hogan <james@...anarts.com> wrote:

> From: James Hogan <james.hogan@...tec.com>
> 
> Note: I'm not in a position to compile test this patch, but I don't
> foresee any problems.
> 
> Since v2.6.20 "Pass struct dev pointer to dma_cache_sync()"
> (d3fa72e4556ec1f04e46a0d561d9e785ecaa173d), dma_cache_sync() takes a
> struct dev pointer, but these appear to be missing from the tile and
> mn10300 implementations, so add them.
> 
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> ---
>  arch/mn10300/include/asm/dma-mapping.h |    2 +-
>  arch/tile/include/asm/dma-mapping.h    |    3 ++-
>  arch/tile/kernel/pci-dma.c             |    2 +-
>  3 files changed, 4 insertions(+), 3 deletions(-)

Looks fine (I don't even compile it though).

btw, mn10300's dma_cache_sync looks wrong.

DMA-API says:

Do a partial sync of memory that was allocated by
dma_alloc_noncoherent(), starting at virtual address vaddr and
continuing on for size.  Again, you *must* observe the cache line
boundaries when doing this.

looks like mn10300's dma_alloc_noncoherent() returns consistent
memory. So dma_cache_sync should be a null function.
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