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

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Date:   Fri, 16 Dec 2022 11:11:39 +0800
From:   Yanjun Zhu <yanjun.zhu@...ux.dev>
To:     Palmer Dabbelt <palmer@...osinc.com>, jgg@...dia.com
Cc:     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

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.

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);