[ Upstream commit 43eb354ecb471426e97b0ce6a0c922ec20f82027 ]

Use the correct parameter name ("__ns") for function parameter kernel-doc
to avoid 3 warnings:

Warning: include/linux/nstree.h:68 function parameter '__ns' not described in 'ns_tree_add_raw'
Warning: include/linux/nstree.h:77 function parameter '__ns' not described in 'ns_tree_add'
Warning: include/linux/nstree.h:88 function parameter '__ns' not described in 'ns_tree_remove'

Fixes: 885fc8ac0a4d ("nstree: make iterator generic")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260416215429.948898-1-rdunlap@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Don't expose it directly. There's no need to do that.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Move the namespace iteration infrastructure originally introduced for
mount namespaces into a generic library usable by all namespace types.

Signed-off-by: Christian Brauner <brauner@kernel.org>