linux-kernel - Re: [PATCH] RDMA/rxe: Avoid unused variable warnings on 32-bit targets

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Date:   Fri, 16 Dec 2022 08:03:22 -0800 (PST)
From:   Palmer Dabbelt <palmer@...osinc.com>
To:     yanjun.zhu@...ux.dev
CC:     jgg@...dia.com, zyjzyj2000@...il.com, jgg@...pe.ca,
        leon@...nel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux@...osinc.com
Subject:     Re: [PATCH] RDMA/rxe: Avoid unused variable warnings on 32-bit targets

On Thu, 15 Dec 2022 19:11:39 PST (-0800), yanjun.zhu@...ux.dev wrote:
> 在 2022/12/16 7:28, Palmer Dabbelt 写道:
>> From: Palmer Dabbelt <palmer@...osinc.com>
>>
>
> In
> https://patchwork.kernel.org/project/linux-rdma/patch/1669905568-62-2-git-send-email-yangx.jy@fujitsu.com/
>
> In this link, it seems that a similar commit for this problem.
> Please check it.

That one also fixes the compile issues for me.

>
> Thanks
> Zhu Yanjun
>
>> These variables are not used on 32-bit targets as there's a big ifdef
>> around their use.  This results on a handful of warnings for 32-bit
>> RISC-V allyesconfig:
>>
>>    CC      drivers/infiniband/sw/rxe/rxe_resp.o
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c: In function 'atomic_write_reply':
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:794:13: error: unused variable 'payload' [-Werror=unused-variable]
>>    794 |         int payload = payload_size(pkt);
>>        |             ^~~~~~~
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:793:24: error: unused variable 'mr' [-Werror=unused-variable]
>>    793 |         struct rxe_mr *mr = qp->resp.mr;
>>        |                        ^~
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:19: error: unused variable 'dst' [-Werror=unused-variable]
>>    791 |         u64 src, *dst;
>>        |                   ^~~
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:13: error: unused variable 'src' [-Werror=unused-variable]
>>    791 |         u64 src, *dst;
>>        |             ^~~
>> cc1: all warnings being treated as errors
>>
>> Fixes: 034e285f8b99 ("RDMA/rxe: Make responder support atomic write on RC service")
>> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
>> ---
>>   drivers/infiniband/sw/rxe/rxe_resp.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
>> index 7a60c7709da0..18977d5a3316 100644
>> --- a/drivers/infiniband/sw/rxe/rxe_resp.c
>> +++ b/drivers/infiniband/sw/rxe/rxe_resp.c
>> @@ -788,10 +788,10 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
>>   static enum resp_states atomic_write_reply(struct rxe_qp *qp,
>>   						struct rxe_pkt_info *pkt)
>>   {
>> -	u64 src, *dst;
>> -	struct resp_res *res = qp->resp.res;
>> -	struct rxe_mr *mr = qp->resp.mr;
>> -	int payload = payload_size(pkt);
>> +	__maybe_unused u64 src, *dst;
>> +	__maybe_unused struct resp_res *res = qp->resp.res;
>> +	__maybe_unused struct rxe_mr *mr = qp->resp.mr;
>> +	__maybe_unused int payload = payload_size(pkt);
>>
>>   	if (!res) {
>>   		res = rxe_prepare_res(qp, pkt, RXE_ATOMIC_WRITE_MASK);