WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#49: 
new file mode 100644

CHECK: spaces preferred around that '*' (ctx:WxO)
#89: FILE: include/linux/nstree.h:36:
+		struct cgroup_namespace *: &(cgroup_ns_tree),	\
 		                        ^

ERROR: spaces required around that ':' (ctx:OxW)
#89: FILE: include/linux/nstree.h:36:
+		struct cgroup_namespace *: &(cgroup_ns_tree),	\
 		                         ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#90: FILE: include/linux/nstree.h:37:
+		struct ipc_namespace *:    &(ipc_ns_tree),	\
 		                     ^

ERROR: spaces required around that ':' (ctx:OxW)
#90: FILE: include/linux/nstree.h:37:
+		struct ipc_namespace *:    &(ipc_ns_tree),	\
 		                      ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#91: FILE: include/linux/nstree.h:38:
+		struct net *:              &(net_ns_tree),	\
 		           ^

ERROR: spaces required around that ':' (ctx:OxW)
#91: FILE: include/linux/nstree.h:38:
+		struct net *:              &(net_ns_tree),	\
 		            ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#92: FILE: include/linux/nstree.h:39:
+		struct pid_namespace *:    &(pid_ns_tree),	\
 		                     ^

ERROR: spaces required around that ':' (ctx:OxW)
#92: FILE: include/linux/nstree.h:39:
+		struct pid_namespace *:    &(pid_ns_tree),	\
 		                      ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#93: FILE: include/linux/nstree.h:40:
+		struct mnt_namespace *:    &(mnt_ns_tree),	\
 		                     ^

ERROR: spaces required around that ':' (ctx:OxW)
#93: FILE: include/linux/nstree.h:40:
+		struct mnt_namespace *:    &(mnt_ns_tree),	\
 		                      ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#94: FILE: include/linux/nstree.h:41:
+		struct time_namespace *:   &(time_ns_tree),	\
 		                      ^

ERROR: spaces required around that ':' (ctx:OxW)
#94: FILE: include/linux/nstree.h:41:
+		struct time_namespace *:   &(time_ns_tree),	\
 		                       ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#95: FILE: include/linux/nstree.h:42:
+		struct user_namespace *:   &(user_ns_tree),	\
 		                      ^

ERROR: spaces required around that ':' (ctx:OxW)
#95: FILE: include/linux/nstree.h:42:
+		struct user_namespace *:   &(user_ns_tree),	\
 		                       ^

CHECK: spaces preferred around that '*' (ctx:WxO)
#96: FILE: include/linux/nstree.h:43:
+		struct uts_namespace *:    &(uts_ns_tree))
 		                     ^

ERROR: spaces required around that ':' (ctx:OxW)
#96: FILE: include/linux/nstree.h:43:
+		struct uts_namespace *:    &(uts_ns_tree))
 		                      ^

WARNING: line length of 85 exceeds 80 columns
#119: FILE: include/linux/nstree.h:66:
+#define ns_tree_add_raw(__ns) __ns_tree_add_raw(to_ns_common(__ns), to_ns_tree(__ns))

WARNING: line length of 84 exceeds 80 columns
#137: FILE: include/linux/nstree.h:84:
+#define ns_tree_remove(__ns)  __ns_tree_remove(to_ns_common(__ns), to_ns_tree(__ns))

WARNING: line length of 81 exceeds 80 columns
#281: FILE: kernel/nstree.c:106:
+		list_add_rcu(&ns->ns_list_node, &node_to_ns(prev)->ns_list_node);

CHECK: Please don't use multiple blank lines
#314: FILE: kernel/nstree.c:139:
+
+

WARNING: line length of 89 exceeds 80 columns
#345: FILE: kernel/nstree.c:170:
+	RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "suspicious ns_tree_lookup_rcu() usage");

WARNING: Prefer using '"%s...", __func__' to using 'ns_tree_lookup_rcu', this function's name, in a string
#345: FILE: kernel/nstree.c:170:
+	RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "suspicious ns_tree_lookup_rcu() usage");

WARNING: line length of 91 exceeds 80 columns
#380: FILE: kernel/nstree.c:205:
+	RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "suspicious ns_tree_adjoined_rcu() usage");

WARNING: line length of 107 exceeds 80 columns
#389: FILE: kernel/nstree.c:214:
+	VFS_WARN_ON_ONCE(list_entry_rcu(list, struct ns_common, ns_list_node)->ops->type != ns_tree->type);

total: 8 errors, 8 warnings, 9 checks, 360 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 60ff3a3b8a9f ("nstree: make iterator generic") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.