linux-kernel - Re: [ofa-general] [PATCH 2.6.30] RDMA/cxgb3: Remove modulo math.

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Message-ID: <499319CF.6050204@opengridcomputing.com>
Date:	Wed, 11 Feb 2009 12:32:47 -0600
From:	Steve Wise <swise@...ngridcomputing.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	randy.dunlap@...cle.com, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, general@...ts.openfabrics.org
Subject: Re: [ofa-general] [PATCH 2.6.30] RDMA/cxgb3: Remove modulo math.

Roland Dreier wrote:
>  > Note that wr->sg_list[i].addr was being cast to a u32.  That was wrong.
>
> Is it possible for the page to be bigger than 4GB?  If so then yes you
> might be chopping off high-order bits or something.
>   
Yes it is possible.

A MR can be created with an iov_base of say 0xffffffff00000000.

Then any sge.addr entries would be the iob_base + any offset.

> Anyway please send me this change as a separate patch with a changelog
> explaining that you're avoiding the div etc.... I don't want to roll it
> in with the other unrelated fix (which changes code that was never
> upstream anyway).
>   

will do. 

So you are handling the offset patch that will make it u64 and remove 
the mod usage, correct?

I will post a new patch with just this send change.

Steve.
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