net: Align the stack infos in net_stack linker section

There can be lot of traffic class threads and each will have
their own stacks. This can trigger issue when traversing the
stacks list in "net stacks" shell command. To overcome this issue,
we need to align each net_stack_info struct by 32 bytes. This is
the same issue that happened with net_if earlier.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

include/net/net_core.h

@@ -105,6 +105,12 @@ int net_recv_data(struct net_if *iface, struct net_pkt *pkt);
  */
 int net_send_data(struct net_pkt *pkt);
 
+/*
+ * The net_stack_info struct needs to be aligned to 32 byte boundary,
+ * otherwise the __net_stack_end will point to wrong location and looping
+ * through net_stack section will go wrong.
+ * So this alignment is a workaround and should eventually be removed.
+ */
 struct net_stack_info {
 	k_thread_stack_t *stack;
 	const char *pretty_name;
@@ -113,7 +119,7 @@ struct net_stack_info {
 	size_t size;
 	int prio;
 	int idx;
-};
+} __aligned(32);
 
 #if defined(CONFIG_NET_SHELL)
 #define NET_STACK_GET_NAME(pretty, name, sfx) \