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Subject[PATCH 18/23] uts: Free uts namespace one RCU grace period after final counter put
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This is needed to link uts_ns into ns_idr in next patch.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
include/linux/utsname.h | 1 +
kernel/utsname.c | 10 +++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 2b1737c9b244..b783d0fe6ca4 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -25,6 +25,7 @@ struct uts_namespace {
struct user_namespace *user_ns;
struct ucounts *ucounts;
struct ns_common ns;
+ struct rcu_head rcu;
} __randomize_layout;
extern struct uts_namespace init_uts_ns;

diff --git a/kernel/utsname.c b/kernel/utsname.c
index b1ac3ca870f2..aebf4df5f592 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -103,12 +103,20 @@ struct uts_namespace *copy_utsname(unsigned long flags,
return new_ns;
}

+static void free_uts_ns_rcu(struct rcu_head *head)
+{
+ struct uts_namespace *ns;
+
+ ns = container_of(head, struct uts_namespace, rcu);
+ kmem_cache_free(uts_ns_cache, ns);
+}
+
void free_uts_ns(struct uts_namespace *ns)
{
dec_uts_namespaces(ns->ucounts);
put_user_ns(ns->user_ns);
ns_free_inum(&ns->ns);
- kmem_cache_free(uts_ns_cache, ns);
+ call_rcu(&ns->rcu, free_uts_ns_rcu);
}

static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)

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