Re: [PATCH v3][next] drm/nouveau: fifo: Avoid -Wflex-array-member-not-at-end warning

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

Hi all,

Friendly ping: who can take this, please?

Thanks
-Gustavo

On 8/14/25 15:01, 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:
> 
> drivers/gpu/drm/nouveau/nvif/fifo.c:29:42: 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 members onto the FAM while preserving the original
> memory layout.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> Changes in v3:
>   - Use the new TRAILING_OVERLAP() helper.
> 
> Changes in v2:
>   - Adjust heap allocation.
> 
>   drivers/gpu/drm/nouveau/nvif/fifo.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvif/fifo.c b/drivers/gpu/drm/nouveau/nvif/fifo.c
> index a463289962b2..b0ab80995d98 100644
> --- a/drivers/gpu/drm/nouveau/nvif/fifo.c
> +++ b/drivers/gpu/drm/nouveau/nvif/fifo.c
> @@ -25,13 +25,12 @@ static int
>   nvif_fifo_runlists(struct nvif_device *device)
>   {
>   	struct nvif_object *object = &device->object;
> -	struct {
> -		struct nv_device_info_v1 m;
> +	TRAILING_OVERLAP(struct nv_device_info_v1, m, data,
>   		struct {
>   			struct nv_device_info_v1_data runlists;
>   			struct nv_device_info_v1_data runlist[64];
>   		} v;
> -	} *a;
> +	) *a;
>   	int ret, i;
>   
>   	if (device->runlist)