linux-kernel - Re: [PATCH v3 1/1] RDMA/rxe: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <ba0fb412-455b-4348-a81c-013e7f40377f@linux.dev>
Date: Tue, 23 Dec 2025 08:13:49 -0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Leon Romanovsky <leon@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavo@...eddedor.com>, zyjzyj2000@...il.com,
 jgg@...pe.ca, linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH v3 1/1] RDMA/rxe: Avoid -Wflex-array-member-not-at-end
 warnings


在 2025/12/23 6:20, Leon Romanovsky 写道:
> On Mon, Dec 22, 2025 at 09:10:11PM -0800, Zhu Yanjun wrote:
>> 在 2025/12/22 21:03, Gustavo A. R. Silva 写道:
>>>
>>> On 12/23/25 13:41, Zhu Yanjun wrote:
>>>> From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
>>>>
>>>> -Wflex-array-member-not-at-end was introduced in GCC-14, and we are
>>>> getting ready to enable it, globally.
>>>>
>>>> Use the new TRAILING_OVERLAP() helper to fix the following warning:
>>>>
>>>> 21 drivers/infiniband/sw/rxe/rxe_verbs.h:271:33: warning: structure
>>>> containing a flexible array member is not at the end of another
>>>> structure [-Wflex-array-member-not-at-end]
>>>>
>>>> This helper creates a union between a flexible-array member (FAM) and a
>>>> set of MEMBERS that would otherwise follow it.
>>>>
>>>> This overlays the trailing MEMBER struct ib_sge sge[RXE_MAX_SGE]; onto
>>>> the FAM struct rxe_recv_wqe::dma.sge, while keeping the FAM and the
>>>> start of MEMBER aligned.
>>>>
>>>> The static_assert() ensures this alignment remains, and it's
>>>> intentionally placed inmediately after the related structure --no
>>>> blank line in between.
>>>>
>>>> Lastly, move the conflicting declaration struct rxe_resp_info resp;
>>>> to the end of the corresponding structure.
>>>>
>>>> Reviewed-by: Zhu Yanjun <yanjun.zhu@...ux.dev>
>>>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>>>> ---
>>>> V2->V3: Replace struct ib_sge with struct rxe_sge
>>> What are you doing?
>> Because struct rxe_sge differs from struct ib_sge, I aligned it to use the
>> same structure.
> Zhu,
>
> Please submit your rxe_sge to ib_sge change as standalone patch and
> Gustavo will resubmit his patch later if he wants so.


OK. I will do soon.

Yanjun.Zhu


>
> Thanks

-- 
Best Regards,
Yanjun.Zhu