linux-kernel - Re: [PATCH][next] RDMA/rxe: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <7e3a294f-5dc2-4e8c-aacc-0286c1592038@linux.dev>
Date: Sun, 14 Dec 2025 21:00:51 -0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Zhu Yanjun <zyjzyj2000@...il.com>, Leon Romanovsky <leon@...nel.org>,
 linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] RDMA/rxe: Avoid -Wflex-array-member-not-at-end
 warnings



在 2025/12/5 20:41, Zhu Yanjun 写道:
> 
> 
> 在 2025/12/4 9:48, yanjun.zhu 写道:
>> On 12/4/25 5:05 AM, Jason Gunthorpe wrote:
>>> On Wed, Dec 03, 2025 at 09:08:45PM -0800, Zhu Yanjun wrote:
>>>>>        unsigned int        res_head;
>>>>>        unsigned int        res_tail;
>>>>>        struct resp_res        *res;
>>>>> +
>>>>> +    /* SRQ only. srq_wqe.dma.sge is a flex array */
>>>>> +    struct rxe_recv_wqe srq_wqe;
>>>>
>>>> drivers/infiniband/sw/rxe/rxe_resp.c: In function get_srq_wqe:
>>>> drivers/infiniband/sw/rxe/rxe_resp.c:289:41: error: struct 
>>>> rxe_recv_wqe has
>>>> no member named wqe
>>>>    289 |         qp->resp.wqe = &qp->resp.srq_wqe.wqe;
>>>>        |                                         ^
>>>
>>> I didn't try to fix all the typos, you will need to do that.
>>
>> Exactly. I will fix this problem. This weekend, I will send out an 
>> official commit.
> Hi, Jason
> 
> The followings are based on your commits and Leon's commits. And it can 
> pass the rdma-core tests.
> 
> I am not sure if this commit is good or not.

Hi, Jason && Leon

Any update? If this looks good to you, I will send out an official 
commit based on the following commit.

Thanks,
Yanjun.Zhu

> 
> 
> diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/ 
> sw/rxe/rxe_verbs.c
> index 38d8c408320f..189eaa59a5fb 100644
> --- a/drivers/infiniband/sw/rxe/rxe_verbs.c
> +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
> @@ -1524,7 +1524,8 @@ static const struct ib_device_ops rxe_dev_ops = {
>          INIT_RDMA_OBJ_SIZE(ib_ah, rxe_ah, ibah),
>          INIT_RDMA_OBJ_SIZE(ib_cq, rxe_cq, ibcq),
>          INIT_RDMA_OBJ_SIZE(ib_pd, rxe_pd, ibpd),
> -       INIT_RDMA_OBJ_SIZE(ib_qp, rxe_qp, ibqp),
> +       /* For resp.srq_wqe.dma.sge */
> +       INIT_RDMA_OBJ_SIZE(ib_qp, rxe_qp, ibqp) + 
> RXE_MAX_SGE*sizeof(struct ib_sge),
>          INIT_RDMA_OBJ_SIZE(ib_srq, rxe_srq, ibsrq),
>          INIT_RDMA_OBJ_SIZE(ib_ucontext, rxe_ucontext, ibuc),
>          INIT_RDMA_OBJ_SIZE(ib_mw, rxe_mw, ibmw),
> diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/ 
> sw/rxe/rxe_verbs.h
> index fd48075810dd..8c17f5f4e318 100644
> --- a/drivers/infiniband/sw/rxe/rxe_verbs.h
> +++ b/drivers/infiniband/sw/rxe/rxe_verbs.h
> @@ -219,12 +219,6 @@ struct rxe_resp_info {
>          u32                     rkey;
>          u32                     length;
> 
> -       /* SRQ only */
> -       struct {
> -               struct rxe_recv_wqe     wqe;
> -               struct ib_sge           sge[RXE_MAX_SGE];
> -       } srq_wqe;
> -
>          /* Responder resources. It's a circular list where the oldest
>           * resource is dropped first.
>           */
> @@ -232,6 +226,12 @@ struct rxe_resp_info {
>          unsigned int            res_head;
>          unsigned int            res_tail;
>          struct resp_res         *res;
> +
> +       /* SRQ only. srq_wqe.dma.sge is a flex array */
> +       struct {
> +               struct rxe_recv_wqe     wqe;
> +               struct ib_sge           sge[RXE_MAX_SGE];
> +       } srq_wqe;
>   };
> 
>   struct rxe_qp {
> @@ -269,7 +269,6 @@ struct rxe_qp {
> 
>          struct rxe_req_info     req;
>          struct rxe_comp_info    comp;
> -       struct rxe_resp_info    resp;
> 
>          atomic_t                ssn;
>          atomic_t                skb_out;
> @@ -289,6 +288,7 @@ struct rxe_qp {
>          spinlock_t              state_lock; /* guard requester and 
> completer */
> 
>          struct execute_work     cleanup_work;
> +       struct rxe_resp_info    resp;
>   };
> 
>   enum {
> 
> Yanjun.Zhu
> 
>>
>> Yanjun.Zhu
>>
>>>
>>> Jason
>>
> 

-- 
Best Regards,
Yanjun.Zhu