linux-kernel - [PATCH][next] drm/nouveau/conn: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <Z-a4meHAy-t58bcE@kspp>
Date: Fri, 28 Mar 2025 08:56:25 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Lyude Paul <lyude@...hat.com>, Danilo Krummrich <dakr@...nel.org>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] drm/nouveau/conn: 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/nvif/conn.c:34:38: 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@...nel.org>
---
 drivers/gpu/drm/nouveau/nvif/conn.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvif/conn.c b/drivers/gpu/drm/nouveau/nvif/conn.c
index 9ee18cb99264..5a1a83c62a2a 100644
--- a/drivers/gpu/drm/nouveau/nvif/conn.c
+++ b/drivers/gpu/drm/nouveau/nvif/conn.c
@@ -30,17 +30,17 @@ int
 nvif_conn_event_ctor(struct nvif_conn *conn, const char *name, nvif_event_func func, u8 types,
 		     struct nvif_event *event)
 {
-	struct {
-		struct nvif_event_v0 base;
-		struct nvif_conn_event_v0 conn;
-	} args;
+	DEFINE_RAW_FLEX(struct nvif_event_v0, args, data,
+			sizeof(struct nvif_conn_event_v0));
+	struct nvif_conn_event_v0 *args_conn =
+				(struct nvif_conn_event_v0 *)args->data;
 	int ret;
 
-	args.conn.version = 0;
-	args.conn.types = types;
+	args_conn->version = 0;
+	args_conn->types = types;
 
 	ret = nvif_event_ctor_(&conn->object, name ?: "nvifConnHpd", nvif_conn_id(conn),
-			       func, true, &args.base, sizeof(args), false, event);
+			       func, true, args, __struct_size(args), false, event);
 	NVIF_DEBUG(&conn->object, "[NEW EVENT:HPD types:%02x]", types);
 	return ret;
 }
-- 
2.43.0