[PATCH 04/11] staging: vchiq_arm: Clear VLA warning

[Stefan Wahren]

The kernel would like to have all stack VLA usage removed[1]. The array
here is fixed (declared with a const variable) but it appears like a VLA
to the compiler. Also, currently we are putting 768 bytes on the
stack. So save stack space and removes the VLA build warning by
making it static.

[1]: https://lkml.org/lkml/2018/3/7/621

CC: Tobin C. Harding <me at tobin.cc>
Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>
---
 .../vc04_services/interface/vchiq_arm/vchiq_arm.c    | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index 24d456b..f276437 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -3414,13 +3414,18 @@ vchiq_release_service(VCHIQ_SERVICE_HANDLE_T handle)
 	return ret;
 }
 
+struct service_data_struct {
+	int fourcc;
+	int clientid;
+	int use_count;
+};
+
 void
 vchiq_dump_service_use_state(VCHIQ_STATE_T *state)
 {
 	VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+	static struct service_data_struct service_data[64];
 	int i, j = 0;
-	/* Only dump 64 services */
-	static const int local_max_services = 64;
 	/* If there's more than 64 services, only dump ones with
 	 * non-zero counts */
 	int only_nonzero = 0;
@@ -3431,11 +3436,6 @@ vchiq_dump_service_use_state(VCHIQ_STATE_T *state)
 	int peer_count;
 	int vc_use_count;
 	int active_services;
-	struct service_data_struct {
-		int fourcc;
-		int clientid;
-		int use_count;
-	} service_data[local_max_services];
 
 	if (!arm_state)
 		return;
@@ -3446,10 +3446,10 @@ vchiq_dump_service_use_state(VCHIQ_STATE_T *state)
 	peer_count = arm_state->peer_use_count;
 	vc_use_count = arm_state->videocore_use_count;
 	active_services = state->unused_service;
-	if (active_services > local_max_services)
+	if (active_services > ARRAY_SIZE(service_data))
 		only_nonzero = 1;
 
-	for (i = 0; (i < active_services) && (j < local_max_services); i++) {
+	for (i = 0; (i < active_services) && (j < ARRAY_SIZE(service_data)); i++) {
 		VCHIQ_SERVICE_T *service_ptr = state->services[i];
 
 		if (!service_ptr)
@@ -3479,7 +3479,7 @@ vchiq_dump_service_use_state(VCHIQ_STATE_T *state)
 		vchiq_log_warning(vchiq_susp_log_level, "Too many active "
 			"services (%d).  Only dumping up to first %d services "
 			"with non-zero use-count", active_services,
-			local_max_services);
+			ARRAY_SIZE(service_data));
 
 	for (i = 0; i < j; i++) {
 		vchiq_log_warning(vchiq_susp_log_level,
-- 
2.7.4