uml: Replace one-element array with zero-element array

To look at users I did:
$ find arch/um/ include/asm-um -name '*.[ch]'|xargs grep -r 'net_kern\.h'
+-l|xargs grep '\<user\>'

Most users just cast user to the appropriate pointer, the remaining ones are
fixed here.  In net_kern.c, I'm almost sure that save trick is not needed
anymore, but I've not verified it.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 4 insertions, 12 deletions

diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index 3f5e8e634308..b2c292a66218 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -347,10 +347,9 @@ static void eth_configure(int n, void *init, char *mac,
         struct uml_net *device;
         struct net_device *dev;
         struct uml_net_private *lp;
-        int save, err, size;
+        int err, size;
 
-        size = transport->private_size + sizeof(struct uml_net_private) +
-                sizeof(((struct uml_net_private *) 0)->user);
+        size = transport->private_size + sizeof(struct uml_net_private);
 
         device = kzalloc(sizeof(*device), GFP_KERNEL);
         if (device == NULL) {
@@ -409,12 +408,6 @@ static void eth_configure(int n, void *init, char *mac,
          */
         (*transport->kern->init)(dev, init);
 
-        /* lp.user is the first four bytes of the transport data, which
-         * has already been initialized.  This structure assignment will
-         * overwrite that, so we make sure that .user gets overwritten with
-         * what it already has.
-         */
-        save = lp->user[0];
         *lp = ((struct uml_net_private)
                 { .list                 = LIST_HEAD_INIT(lp->list),
                   .dev                  = dev,
@@ -428,8 +421,7 @@ static void eth_configure(int n, void *init, char *mac,
                   .write                = transport->kern->write,
                   .add_address          = transport->user->add_address,
                   .delete_address       = transport->user->delete_address,
-                  .set_mtu              = transport->user->set_mtu,
-                  .user                 = { save } });
+                  .set_mtu              = transport->user->set_mtu });
 
         init_timer(&lp->tl);
         spin_lock_init(&lp->lock);
diff --git a/arch/um/include/net_kern.h b/arch/um/include/net_kern.h
index 125ab42df18a..9237056b9103 100644
--- a/arch/um/include/net_kern.h
+++ b/arch/um/include/net_kern.h
@@ -40,7 +40,7 @@ struct uml_net_private {
         void (*add_address)(unsigned char *, unsigned char *, void *);
         void (*delete_address)(unsigned char *, unsigned char *, void *);
         int (*set_mtu)(int mtu, void *);
-        int user[1];
+        char user[0];
 };
 
 struct net_kern_info {