bpf: Change func bpf_iter_unreg_target() signature

Change func bpf_iter_unreg_target() parameter from target
name to target reg_info, similar to bpf_iter_reg_target().
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200513180220.2949737-1-yhs@fb.com

include/linux/bpf.h

@@ -1154,7 +1154,7 @@ struct bpf_iter_meta {
 };
 
 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
-void bpf_iter_unreg_target(const char *target);
+void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
 bool bpf_iter_prog_supported(struct bpf_prog *prog);
 int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
 int bpf_iter_new_fd(struct bpf_link *link);

kernel/bpf/bpf_iter.c

@@ -257,14 +257,14 @@ int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info)
 	return 0;
 }
 
-void bpf_iter_unreg_target(const char *target)
+void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info)
 {
 	struct bpf_iter_target_info *tinfo;
 	bool found = false;
 
 	mutex_lock(&targets_mutex);
 	list_for_each_entry(tinfo, &targets, list) {
-		if (!strcmp(target, tinfo->reg_info->target)) {
+		if (reg_info == tinfo->reg_info) {
 			list_del(&tinfo->list);
 			kfree(tinfo);
 			found = true;

net/ipv6/route.c

@@ -6412,7 +6412,7 @@ static int __init bpf_iter_register(void)
 
 static void bpf_iter_unregister(void)
 {
-	bpf_iter_unreg_target("ipv6_route");
+	bpf_iter_unreg_target(&ipv6_route_reg_info);
 }
 #endif
 #endif