drm/nouveau: fence: Avoid -Wflex-array-member-not-at-end warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with these changes, fix the following warning:

drivers/gpu/drm/nouveau/nouveau_fence.c:188:38: 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@kernel.org>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://lore.kernel.org/r/Z-2r6v-Cji7vwOsz@kspp

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 7cc84472cecec2c7cbf5786b83772eb1ddf4b279..7622587f149e6270933d2d5d6f27ea6f731faba7 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -184,10 +184,10 @@ nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_cha
        struct nouveau_cli *cli = chan->cli;
        struct nouveau_drm *drm = cli->drm;
        struct nouveau_fence_priv *priv = (void*)drm->fence;
-       struct {
-               struct nvif_event_v0 base;
-               struct nvif_chan_event_v0 host;
-       } args;
+       DEFINE_RAW_FLEX(struct nvif_event_v0, args, data,
+                       sizeof(struct nvif_chan_event_v0));
+       struct nvif_chan_event_v0 *host =
+                               (struct nvif_chan_event_v0 *)args->data;
        int ret;
 
        INIT_WORK(&fctx->uevent_work, nouveau_fence_uevent_work);
@@ -207,12 +207,12 @@ nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_cha
        if (!priv->uevent)
                return;
 
-       args.host.version = 0;
-       args.host.type = NVIF_CHAN_EVENT_V0_NON_STALL_INTR;
+       host->version = 0;
+       host->type = NVIF_CHAN_EVENT_V0_NON_STALL_INTR;
 
        ret = nvif_event_ctor(&chan->user, "fenceNonStallIntr", (chan->runlist << 16) | chan->chid,
                              nouveau_fence_wait_uevent_handler, false,
-                             &args.base, sizeof(args), &fctx->event);
+                             args, __struct_size(args), &fctx->event);
 
        WARN_ON(ret);
 }