xmalloc: drop pool list

From its introduction it has been used solely to add and remove pools.
No list traversal or alike did ever occur. Drop all of this as being dead
code.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/common/xmalloc_tlsf.c

@@ -66,9 +66,6 @@
 #define PREV_FREE       (0x2)
 #define PREV_USED       (0x0)
 
-static DEFINE_SPINLOCK(pool_list_lock);
-static LIST_HEAD(pool_list_head);
-
 struct free_ptr {
     struct bhdr *prev;
     struct bhdr *next;
@@ -113,8 +110,6 @@ struct xmem_pool {
     xmem_pool_get_memory *get_mem;
     xmem_pool_put_memory *put_mem;
 
-    struct list_head list;
-
     char name[MAX_POOL_NAME_LEN];
 };
 
@@ -340,10 +335,6 @@ struct xmem_pool *xmem_pool_create(
 
     spin_lock_init(&pool->lock);
 
-    spin_lock(&pool_list_lock);
-    list_add_tail(&pool->list, &pool_list_head);
-    spin_unlock(&pool_list_lock);
-
     return pool;
 }
 
@@ -373,10 +364,6 @@ void xmem_pool_destroy(struct xmem_pool *pool)
                "%lu bytes still in use.\n",
                pool->name, pool, xmem_pool_get_used_size(pool));
 
-    spin_lock(&pool_list_lock);
-    list_del_init(&pool->list);
-    spin_unlock(&pool_list_lock);
-
     pool_bytes = ROUNDUP_SIZE(sizeof(*pool));
     pool_order = get_order_from_bytes(pool_bytes);
     free_xenheap_pages(pool,pool_order);