1 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 46a2ba617595..a3ed5e059d47 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -95,14 +95,19 @@ struct dentry {
         struct qstr d_name;
 
         struct list_head d_lru;         /* LRU list */
-        struct list_head d_child;       /* child of parent list */
+        /*
+         * d_child and d_rcu can share memory
+         */
+        union {
+                struct list_head d_child;       /* child of parent list */
+                struct rcu_head d_rcu;
+        } d_u;
         struct list_head d_subdirs;     /* our children */
         struct list_head d_alias;       /* inode alias list */
         unsigned long d_time;           /* used by d_revalidate */
         struct dentry_operations *d_op;
         struct super_block *d_sb;       /* The root of the dentry tree */
         void *d_fsdata;                 /* fs-specific data */
-        struct rcu_head d_rcu;
         struct dcookie_struct *d_cookie; /* cookie, if any */
         int d_mounted;
         unsigned char d_iname[DNAME_INLINE_LEN_MIN];    /* small names */