pid: rely on common reference count behavior

Now that we changed the generic reference counting mechanism for all
namespaces to never manipulate reference counts of initial namespaces we
can drop the special handling for pid namespaces.

Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-15-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 445517a72ad0602e528e4b13364ddf8fc40a0b0c..0e7ae12c96d2aea1c8cd14ed3578f92e20317155 100644 (file)
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -61,8 +61,7 @@ static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)
 
 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
 {
-       if (ns != &init_pid_ns)
-               ns_ref_inc(ns);
+       ns_ref_inc(ns);
        return ns;
 }
 

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 650be58d8d1864e14693ab6a3d6f31db03e63251..e48f5de4136138dc61512d3a4c5dcf58f3a43273 100644 (file)
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -184,7 +184,7 @@ struct pid_namespace *copy_pid_ns(u64 flags,
 
 void put_pid_ns(struct pid_namespace *ns)
 {
-       if (ns && ns != &init_pid_ns && ns_ref_put(ns))
+       if (ns && ns_ref_put(ns))
                schedule_work(&ns->work);
 }
 EXPORT_SYMBOL_GPL(put_pid_ns);