bpf: Make unnecessarily global functions static

Make the functions __local_list_pop_free(), __local_list_pop_pending(),
bpf_common_lru_populate() and bpf_percpu_lru_populate() static as they
are not used outide of bpf_lru_list.c

This fixes the following GCC warnings when building with 'W=1':

  kernel/bpf/bpf_lru_list.c:363:22: warning: no previous prototype for ‘__local_list_pop_free’ [-Wmissing-prototypes]
  kernel/bpf/bpf_lru_list.c:376:22: warning: no previous prototype for ‘__local_list_pop_pending’ [-Wmissing-prototypes]
  kernel/bpf/bpf_lru_list.c:560:6: warning: no previous prototype for ‘bpf_common_lru_populate’ [-Wmissing-prototypes]
  kernel/bpf/bpf_lru_list.c:577:6: warning: no previous prototype for ‘bpf_percpu_lru_populate’ [-Wmissing-prototypes]

Cc: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

kernel/bpf/bpf_lru_list.c

@@ -360,7 +360,8 @@ static void __local_list_add_pending(struct bpf_lru *lru,
 	list_add(&node->list, local_pending_list(loc_l));
 }
 
-struct bpf_lru_node *__local_list_pop_free(struct bpf_lru_locallist *loc_l)
+static struct bpf_lru_node *
+__local_list_pop_free(struct bpf_lru_locallist *loc_l)
 {
 	struct bpf_lru_node *node;
 
@@ -373,8 +374,8 @@ struct bpf_lru_node *__local_list_pop_free(struct bpf_lru_locallist *loc_l)
 	return node;
 }
 
-struct bpf_lru_node *__local_list_pop_pending(struct bpf_lru *lru,
-					      struct bpf_lru_locallist *loc_l)
+static struct bpf_lru_node *
+__local_list_pop_pending(struct bpf_lru *lru, struct bpf_lru_locallist *loc_l)
 {
 	struct bpf_lru_node *node;
 	bool force = false;
@@ -557,8 +558,9 @@ void bpf_lru_push_free(struct bpf_lru *lru, struct bpf_lru_node *node)
 		bpf_common_lru_push_free(lru, node);
 }
 
-void bpf_common_lru_populate(struct bpf_lru *lru, void *buf, u32 node_offset,
-			     u32 elem_size, u32 nr_elems)
+static void bpf_common_lru_populate(struct bpf_lru *lru, void *buf,
+				    u32 node_offset, u32 elem_size,
+				    u32 nr_elems)
 {
 	struct bpf_lru_list *l = &lru->common_lru.lru_list;
 	u32 i;
@@ -574,8 +576,9 @@ void bpf_common_lru_populate(struct bpf_lru *lru, void *buf, u32 node_offset,
 	}
 }
 
-void bpf_percpu_lru_populate(struct bpf_lru *lru, void *buf, u32 node_offset,
-			     u32 elem_size, u32 nr_elems)
+static void bpf_percpu_lru_populate(struct bpf_lru *lru, void *buf,
+				    u32 node_offset, u32 elem_size,
+				    u32 nr_elems)
 {
 	u32 i, pcpu_entries;
 	int cpu;