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

[Leon Romanovsky <leon@kernel.org>]

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@kernel.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@linux.dev>
> > > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.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.

Thanks