linux-kernel - RE: [PATCH v2 04/11] async_xor: permit callers to pass in a 'dma/page scribble' region

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Date:	Fri, 29 May 2009 14:41:50 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	"Williams, Dan J" <dan.j.williams@...el.com>
CC:	"neilb@...e.de" <neilb@...e.de>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"maan@...temlinux.org" <maan@...temlinux.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yur@...raft.com" <yur@...raft.com>,
	"hpa@...or.com" <hpa@...or.com>
Subject: RE: [PATCH v2 04/11] async_xor: permit callers to pass in a
 'dma/page scribble' region

Dan Williams wrote:
> async_xor() needs space to perform dma and page address conversions.  In
> most cases the code can simply reuse the struct page * array because the
> size of the native pointer matches the size of a dma/page address.  In
> order to support archs where sizeof(dma_addr_t) is larger than
> sizeof(struct page *), or to preserve the input parameters, we utilize a
> memory region passed in by the caller.
> 
> Since the code is now prepared to handle the case where it cannot
> perform address conversions on the stack, we no longer need the
> !HIGHMEM64G dependency in drivers/dma/Kconfig.
> 
> [ Impact: don't clobber input buffers for address conversions ]
> 
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  crypto/async_tx/async_xor.c |   59 ++++++++++++++++++++-----------------------
>  drivers/dma/Kconfig         |    2 +
>  2 files changed, 29 insertions(+), 32 deletions(-)

Acked-by: Maciej Sosnowski <maciej.sosnowski@...el.com>--
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