linux-kernel - Re: [PATCH][next] drm/nouveau: Avoid multiple -Wflex-array-member-not-at-end warnings

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Message-ID: <df8b8d59-470f-43e6-a8c2-cc40a4ebe5d6@kernel.org>
Date: Thu, 27 Feb 2025 19:34:58 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] drm/nouveau: Avoid multiple
 -Wflex-array-member-not-at-end warnings

On 2/12/25 10:01 AM, 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.
> 
> So, in order to avoid ending up with flexible-array members in the
> middle of other structs, we use the `struct_group_tagged()` helper
> to separate the flexible arrays from the rest of the members in the
> flexible structures. We then use the newly created tagged `struct
> nvif_ioctl_v0_hdr` and `struct nvif_ioctl_mthd_v0_hdr` to replace the
> type of the objects causing trouble in multiple structures.
> 
> We also want to ensure that when new members need to be added to the
> flexible structures, they are always included within the newly created
> tagged structs. For this, we use `static_assert()`. This ensures that the
> memory layout for both the flexible structure and the new tagged struct
> is the same after any changes.
> 
> So, with these changes, fix the following warnings:
> drivers/gpu/drm/nouveau/nvif/object.c:60:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nvif/object.c:233:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nvif/object.c:214:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nvif/object.c:152:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nvif/object.c:138:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nvif/object.c:104:38: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nouveau_svm.c:83:35: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/gpu/drm/nouveau/nouveau_svm.c:82:30: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Applied to drm-misc-next, thanks!