mm: list_lru: remove unused macro list_lru_init_key()

list_lru_init_key() isn't used by anyone, remove it to clean up.

Link: https://lkml.kernel.org/r/20231228062715.338672-2-haifeng.xu@shopee.comSigned-off-by: Haifeng Xu <haifeng.xu@shopee.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/list_lru.h

@@ -62,8 +62,6 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware,
 
 #define list_lru_init(lru)				\
 	__list_lru_init((lru), false, NULL, NULL)
-#define list_lru_init_key(lru, key)			\
-	__list_lru_init((lru), false, (key), NULL)
 #define list_lru_init_memcg(lru, shrinker)		\
 	__list_lru_init((lru), true, NULL, shrinker)