staging: vchiq_core: get the rid of IS_POW2

The macro IS_POW2 is only used to ensure some size are powers of 2.
Better use BUILD_BUG_ON_NOT_POWER_OF_2 for this. Since this must be done
in a function, merge all these checks in a new function.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1622735405-9980-5-git-send-email-stefan.wahren@i2se.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c

@@ -124,12 +124,19 @@ enum {
 
 /* we require this for consistency between endpoints */
 vchiq_static_assert(sizeof(struct vchiq_header) == 8);
-vchiq_static_assert(IS_POW2(sizeof(struct vchiq_header)));
-vchiq_static_assert(IS_POW2(VCHIQ_NUM_CURRENT_BULKS));
-vchiq_static_assert(IS_POW2(VCHIQ_NUM_SERVICE_BULKS));
-vchiq_static_assert(IS_POW2(VCHIQ_MAX_SERVICES));
 vchiq_static_assert(VCHIQ_VERSION >= VCHIQ_VERSION_MIN);
 
+static inline void check_sizes(void)
+{
+	BUILD_BUG_ON_NOT_POWER_OF_2(VCHIQ_SLOT_SIZE);
+	BUILD_BUG_ON_NOT_POWER_OF_2(VCHIQ_MAX_SLOTS);
+	BUILD_BUG_ON_NOT_POWER_OF_2(VCHIQ_MAX_SLOTS_PER_SIDE);
+	BUILD_BUG_ON_NOT_POWER_OF_2(sizeof(struct vchiq_header));
+	BUILD_BUG_ON_NOT_POWER_OF_2(VCHIQ_NUM_CURRENT_BULKS);
+	BUILD_BUG_ON_NOT_POWER_OF_2(VCHIQ_NUM_SERVICE_BULKS);
+	BUILD_BUG_ON_NOT_POWER_OF_2(VCHIQ_MAX_SERVICES);
+}
+
 /* Run time control of log level, based on KERN_XXX level. */
 int vchiq_core_log_level = VCHIQ_LOG_DEFAULT;
 int vchiq_core_msg_log_level = VCHIQ_LOG_DEFAULT;
@@ -2206,6 +2213,8 @@ vchiq_init_slots(void *mem_base, int mem_size)
 	int num_slots = (mem_size - mem_align)/VCHIQ_SLOT_SIZE;
 	int first_data_slot = VCHIQ_SLOT_ZERO_SLOTS;
 
+	check_sizes();
+
 	/* Ensure there is enough memory to run an absolutely minimum system */
 	num_slots -= first_data_slot;
 

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.h

@@ -69,13 +69,6 @@
 	extern int vchiq_static_assert[(cond) ? 1 : -1]
 #endif
 
-#define IS_POW2(x) (x && ((x & (x - 1)) == 0))
-
-/* Ensure that the slot size and maximum number of slots are powers of 2 */
-vchiq_static_assert(IS_POW2(VCHIQ_SLOT_SIZE));
-vchiq_static_assert(IS_POW2(VCHIQ_MAX_SLOTS));
-vchiq_static_assert(IS_POW2(VCHIQ_MAX_SLOTS_PER_SIDE));
-
 #define VCHIQ_SLOT_MASK        (VCHIQ_SLOT_SIZE - 1)
 #define VCHIQ_SLOT_QUEUE_MASK  (VCHIQ_MAX_SLOTS_PER_SIDE - 1)
 #define VCHIQ_SLOT_ZERO_SLOTS  DIV_ROUND_UP(sizeof(struct vchiq_slot_zero), \