diff --git a/include/linux/utsname.h b/include/linux/utsname.h index 44429d9142ca..2b1737c9b244 100644 --- a/include/linux/utsname.h +++ b/include/linux/utsname.h @@ -4,7 +4,6 @@ #include -#include #include #include #include @@ -22,7 +21,6 @@ struct user_namespace; extern struct user_namespace init_user_ns; struct uts_namespace { - struct kref kref; struct new_utsname name; struct user_namespace *user_ns; struct ucounts *ucounts; @@ -33,16 +31,17 @@ extern struct uts_namespace init_uts_ns; #ifdef CONFIG_UTS_NS static inline void get_uts_ns(struct uts_namespace *ns) { - kref_get(&ns->kref); + refcount_inc(&ns->ns.count); } extern struct uts_namespace *copy_utsname(unsigned long flags, struct user_namespace *user_ns, struct uts_namespace *old_ns); -extern void free_uts_ns(struct kref *kref); +extern void free_uts_ns(struct uts_namespace *ns); static inline void put_uts_ns(struct uts_namespace *ns) { - kref_put(&ns->kref, free_uts_ns); + if (refcount_dec_and_test(&ns->ns.count)) + free_uts_ns(ns); } void uts_ns_init(void); diff --git a/init/version.c b/init/version.c index cba341161b58..80d2b7566b39 100644 --- a/init/version.c +++ b/init/version.c @@ -25,7 +25,7 @@ int version_string(LINUX_VERSION_CODE); #endif struct uts_namespace init_uts_ns = { - .kref = KREF_INIT(2), + .ns.count = REFCOUNT_INIT(2), .name = { .sysname = UTS_SYSNAME, .nodename = UTS_NODENAME, diff --git a/kernel/utsname.c b/kernel/utsname.c index e488d0e2ab45..b1ac3ca870f2 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -33,7 +33,7 @@ static struct uts_namespace *create_uts_ns(void) uts_ns = kmem_cache_alloc(uts_ns_cache, GFP_KERNEL); if (uts_ns) - kref_init(&uts_ns->kref); + refcount_set(&uts_ns->ns.count, 1); return uts_ns; } @@ -103,11 +103,8 @@ struct uts_namespace *copy_utsname(unsigned long flags, return new_ns; } -void free_uts_ns(struct kref *kref) +void free_uts_ns(struct uts_namespace *ns) { - struct uts_namespace *ns; - - ns = container_of(kref, struct uts_namespace, kref); dec_uts_namespaces(ns->ucounts); put_user_ns(ns->user_ns); ns_free_inum(&ns->ns);