Merge: Namespace subsystem proactive fixes for RHEL 10.2

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/1535

Backport all fixes in upstream Linux not found in RHEL 10.2 tree per paths in [owners.yaml](https://gitlab.com/redhat/centos-stream/src/kernel/documentation/-/blob/main/info/owners.yaml?ref_type=heads).

Omitted-fix: edd3cb0 ("copy_process: pass clone_flags as u64 across calltree")
* This patch modifies functions signatures tree wide and is not explicitly a fix within the scope of this backport.

JIRA: https://issues.redhat.com/browse/RHEL-112480

Signed-off-by: Joel Savitz <jsavitz@redhat.com>

Approved-by: Waiman Long <longman@redhat.com>
Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: Rafael Aquini <raquini@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Scott Weaver <scweaver@redhat.com>

Author: swvrrh

include/linux/time_namespace.h

@@ -12,6 +12,7 @@
 struct user_namespace;
 extern struct user_namespace init_user_ns;
 
+struct seq_file;
 struct vm_area_struct;
 
 struct timens_offsets {

kernel/ucount.c

@@ -212,7 +212,7 @@ void put_ucounts(struct ucounts *ucounts)
 	}
 }
 
-static inline bool atomic_long_inc_below(atomic_long_t *v, int u)
+static inline bool atomic_long_inc_below(atomic_long_t *v, long u)
 {
 	long c, old;
 	c = atomic_long_read(v);