netdev - Re: [PATCH] cxgb4vf: remove obsolete DECLARE_PCI_UNMAP

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Message-Id: <20100708190126X.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 08 Jul 2010 19:01:26 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	leedom@...lsio.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] cxgb4vf: remove obsolete DECLARE_PCI_UNMAP_ADDR usage

On Thu, 8 Jul 2010 18:52:37 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> We could use DEFINE_DMA_UNMAP_ADDR instead but using
> CONFIG_NEED_DMA_MAP_STATE is a simpler way to see if a platform does
> real DMA unmapping.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> ---
>  drivers/net/cxgb4vf/sge.c |   14 +++++---------
>  1 files changed, 5 insertions(+), 9 deletions(-)

btw, I'm not sure that seeing if a platform does real DMA unmapping in
a driver is a good thing. But I suppose that we need to accept it if
this leads to big performance boost.

Both can be applied to net-next.
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