drm/nv40: allocate ctxprog with kmalloc

Some archs defconfigs have CONFIG_FRAME_WARN set to 1024, which lead to this
warning:
drivers/gpu/drm/nouveau/core/engine/graph/ctxnv40.c: warning: the frame size
of 1184 bytes is larger than 1024 bytes

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/engine/graph/ctxnv40.c

@@ -669,21 +669,27 @@ nv40_grctx_fill(struct nouveau_device *device, struct nouveau_gpuobj *mem)
 			   });
 }
 
-void
+int
 nv40_grctx_init(struct nouveau_device *device, u32 *size)
 {
-	u32 ctxprog[256], i;
+	u32 *ctxprog = kmalloc(256 * 4, GFP_KERNEL), i;
 	struct nouveau_grctx ctx = {
 		.device = device,
 		.mode = NOUVEAU_GRCTX_PROG,
 		.data = ctxprog,
-		.ctxprog_max = ARRAY_SIZE(ctxprog)
+		.ctxprog_max = 256,
 	};
 
+	if (!ctxprog)
+		return -ENOMEM;
+
 	nv40_grctx_generate(&ctx);
 
 	nv_wr32(device, 0x400324, 0);
 	for (i = 0; i < ctx.ctxprog_len; i++)
 		nv_wr32(device, 0x400328, ctxprog[i]);
 	*size = ctx.ctxvals_pos * 4;
+
+	kfree(ctxprog);
+	return 0;
 }

drivers/gpu/drm/nouveau/core/engine/graph/nv40.c

@@ -346,7 +346,9 @@ nv40_graph_init(struct nouveau_object *object)
 		return ret;
 
 	/* generate and upload context program */
-	nv40_grctx_init(nv_device(priv), &priv->size);
+	ret = nv40_grctx_init(nv_device(priv), &priv->size);
+	if (ret)
+		return ret;
 
 	/* No context present currently */
 	nv_wr32(priv, NV40_PGRAPH_CTXCTL_CUR, 0x00000000);

drivers/gpu/drm/nouveau/core/engine/graph/nv40.h

@@ -15,7 +15,7 @@ nv44_graph_class(void *priv)
 	return !(0x0baf & (1 << (device->chipset & 0x0f)));
 }
 
-void nv40_grctx_init(struct nouveau_device *, u32 *size);
+int  nv40_grctx_init(struct nouveau_device *, u32 *size);
 void nv40_grctx_fill(struct nouveau_device *, struct nouveau_gpuobj *);
 
 #endif