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

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Message-ID: <4991D19B.5050307@oracle.com>
Date:	Tue, 10 Feb 2009 11:12:27 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Steve Wise <swise@...ngridcomputing.com>
CC:	rdreier@...co.com, general@...ts.openfabrics.org,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.30] RDMA/cxgb3: Remove modulo math.

Steve Wise wrote:
> 
> Randy Dunlap wrote:
>> Steve Wise wrote:
>>  
>>> From: Steve Wise <swise@...ngridcomputing.com>
>>>
>>> Removes the need for special u64 math on i386 systems.
>>>
>>> Fixes i386 build break in linux-next introduced by commit
>>> 1e27e8cee0698259ccb1fe6abeaf4b48969c0945.
>>>
>>> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
>>>     
>>
>> Yes, that works, thanks.  But this patch should go into 2.6.29, not
>> just 2.6.30.
>>
>>
>>   
> I thought the commit that caused this was:
> 
> 1e27e8cee0698259ccb1fe6abeaf4b48969c0945
> 
> And that was going in 2.6.30.  (I thought).

Oh, OK.  If that's the case, then you are obviously correct
about [2.6.30].

Thanks.

>>> ---
>>>
>>>  drivers/infiniband/hw/cxgb3/iwch_qp.c |    8 ++++----
>>>  1 files changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/infiniband/hw/cxgb3/iwch_qp.c
>>> b/drivers/infiniband/hw/cxgb3/iwch_qp.c
>>> index 2cf6f13..5bb299a 100644
>>> --- a/drivers/infiniband/hw/cxgb3/iwch_qp.c
>>> +++ b/drivers/infiniband/hw/cxgb3/iwch_qp.c
>>> @@ -232,8 +232,8 @@ static int iwch_sgl2pbl_map(struct iwch_dev *rhp,
>>> struct ib_sge *sg_list,
>>>              return -EINVAL;
>>>          }
>>>          offset = sg_list[i].addr - mhp->attr.va_fbo;
>>> -        offset += ((u64) mhp->attr.va_fbo) %
>>> -                  (1UL << (12 + mhp->attr.page_size));
>>> +        offset += mhp->attr.va_fbo &
>>> +              ((1UL << (12 + mhp->attr.page_size)) - 1);
>>>          pbl_addr[i] = ((mhp->attr.pbl_addr -
>>>                      rhp->rdev.rnic_info.pbl_base) >> 3) +
>>>                    (offset >> (12 + mhp->attr.page_size));
>>> @@ -263,8 +263,8 @@ static int build_rdma_recv(struct iwch_qp *qhp,
>>> union t3_wr *wqe,
>>>          wqe->recv.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
>>>  
>>>          /* to in the WQE == the offset into the page */
>>> -        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));
>>>  
>>>          /* pbl_addr is the adapters address in the PBL */
>>>          wqe->recv.pbl_addr[i] = cpu_to_be32(pbl_addr[i]);


-- 
~Randy
--
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