From: "Michael Chan" <mchan@broadcom.com>
To: "Jeff Garzik" <jeff@garzik.org>
Cc: "David Miller" <davem@davemloft.net>, "netdev" <netdev@vger.kernel.org>
Subject: Re: [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708.
Date: Wed, 02 May 2007 11:23:52 -0700 [thread overview]
Message-ID: <1178130232.4820.62.camel@dell> (raw)
In-Reply-To: <4638AE42.5000908@garzik.org>
On Wed, 2007-05-02 at 11:29 -0400, Jeff Garzik wrote:
> Michael Chan wrote:
> > A non-IOMMU system using 64-bit dma_addr_t will always set
> > CONFIG_HIGHMEM, right?
>
> No.
>
May be I misunderstood the code in illegal_highdma() in net/core/dev.c
where it is checking to see if it needs to linearize the SKB when the
device does not support 64-bit DMA. I'm using similar assumptions for
the 40-bit address check in the patch.
next prev parent reply other threads:[~2007-05-02 17:43 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-02 1:13 [PATCH 3/20][BNX2]: Add 40-bit DMA workaround for 5708 Michael Chan
2007-05-02 7:06 ` Jeff Garzik
2007-05-02 7:12 ` David Miller
2007-05-02 15:23 ` Michael Chan
2007-05-02 15:28 ` Christoph Hellwig
2007-05-02 15:29 ` Jeff Garzik
2007-05-02 18:23 ` Michael Chan [this message]
2007-05-02 18:24 ` Jeff Garzik
2007-05-02 20:02 ` Michael Chan
2007-05-02 20:30 ` Jeff Garzik
2007-05-02 22:48 ` Christoph Hellwig
2007-05-02 22:50 ` David Miller
2007-05-02 19:40 ` David Miller
2007-05-02 21:27 ` Michael Chan
2007-05-02 21:45 ` David Miller
2007-05-02 23:28 ` Michael Chan
2007-05-02 22:48 ` David Miller
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