userns: Use cred->user_ns instead of cred->user->user_ns

Optimize performance and prepare for the removal of the user_ns reference
from user_struct.  Remove the slow long walk through cred->user->user_ns and
instead go straight to cred->user_ns.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 3b906e98b1db..f084083a0fd3 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -90,7 +90,7 @@ uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t
 {
         struct user_namespace *tmp;
 
-        if (likely(to == cred->user->user_ns))
+        if (likely(to == cred->user_ns))
                 return uid;
 
 
@@ -112,7 +112,7 @@ gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t
 {
         struct user_namespace *tmp;
 
-        if (likely(to == cred->user->user_ns))
+        if (likely(to == cred->user_ns))
                 return gid;
 
         /* Is cred->user the creator of the target user_ns