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

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Date:	Wed, 11 Feb 2009 09:44:42 -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:
> I'll roll this into the offending patch (that is in -next).
>
> But:
>
>  > -		wqe->recv.sgl[i].to = cpu_to_be64(((u32) wr->sg_list[i].addr) %
>  > -				(1UL << (12 + page_size[i])));
>  > +		wqe->recv.sgl[i].to = cpu_to_be64(((u64) wr->sg_list[i].addr) &
>  > +				((1UL << (12 + page_size[i]))-1));
>
> Is this required?  Strength reduction optimization should do this
> automatically (and the code has been there for quite a while, so
> obviously it isn't causing problems)
>
>  - R.
>   

Note that wr->sg_list[i].addr was being cast to a u32.  That was wrong.


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