linux-kernel - Re: [PATCH][next] ocfs2: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <afd13315-7129-4f10-8e29-7832a00a4817@embeddedor.com>
Date: Mon, 17 Nov 2025 14:47:22 +0900
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Heming Zhao <heming.zhao@...e.com>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Mark Fasheh <mark@...heh.com>, Joel Becker <jlbec@...lplan.org>,
 Joseph Qi <joseph.qi@...ux.alibaba.com>, ocfs2-devel@...ts.linux.dev,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] ocfs2: Avoid -Wflex-array-member-not-at-end warning

On 11/17/25 14:32, Heming Zhao wrote:
> On Tue, Nov 11, 2025 at 12:01:19PM +0900, Gustavo A. R. Silva wrote:
>> -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:
>>
>> fs/ocfs2/xattr.c:52:41: 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 ocfs2_extent_rec er; onto the
>> FAM struct ocfs2_xattr_value_root::xr_list.l_recs[], 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.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> 
> LGTM.
> Reviewed-by: Heming Zhao <heming.zhao@...e.com>

Thanks, Heming.

-Gustavo