Follow the common pattern and define *_DIAG_MAX like:

        [...]
        __XXX_DIAG_MAX,
};

Because everyone is used to do:

        struct nlattr *attrs[XXX_DIAG_MAX+1];

        nla_parse([...], XXX_DIAG_MAX, [...]

Reported-by: Thomas Graf <tg...@suug.ch>
Cc: "David S. Miller" <da...@davemloft.net>
Cc: Pavel Emelyanov <xe...@parallels.com>
Cc: Eric Dumazet <eduma...@google.com>
Cc: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
Cc: David Howells <dhowe...@redhat.com>
Signed-off-by: Andrey Vagin <ava...@openvz.org>
---
 include/uapi/linux/netlink_diag.h | 4 +++-
 include/uapi/linux/packet_diag.h  | 4 +++-
 include/uapi/linux/unix_diag.h    | 4 +++-
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/netlink_diag.h 
b/include/uapi/linux/netlink_diag.h
index 9328866..88009a3 100644
--- a/include/uapi/linux/netlink_diag.h
+++ b/include/uapi/linux/netlink_diag.h
@@ -29,9 +29,11 @@ enum {
        NETLINK_DIAG_MEMINFO,
        NETLINK_DIAG_GROUPS,
 
-       NETLINK_DIAG_MAX,
+       __NETLINK_DIAG_MAX,
 };
 
+#define NETLINK_DIAG_MAX (__NETLINK_DIAG_MAX - 1)
+
 #define NDIAG_PROTO_ALL                ((__u8) ~0)
 
 #define NDIAG_SHOW_MEMINFO     0x00000001 /* show memory info of a socket */
diff --git a/include/uapi/linux/packet_diag.h b/include/uapi/linux/packet_diag.h
index 93f5fa9..afafd70 100644
--- a/include/uapi/linux/packet_diag.h
+++ b/include/uapi/linux/packet_diag.h
@@ -33,9 +33,11 @@ enum {
        PACKET_DIAG_TX_RING,
        PACKET_DIAG_FANOUT,
 
-       PACKET_DIAG_MAX,
+       __PACKET_DIAG_MAX,
 };
 
+#define PACKET_DIAG_MAX (__PACKET_DIAG_MAX - 1)
+
 struct packet_diag_info {
        __u32   pdi_index;
        __u32   pdi_version;
diff --git a/include/uapi/linux/unix_diag.h b/include/uapi/linux/unix_diag.h
index b8a2494..b9e2a6a 100644
--- a/include/uapi/linux/unix_diag.h
+++ b/include/uapi/linux/unix_diag.h
@@ -39,9 +39,11 @@ enum {
        UNIX_DIAG_MEMINFO,
        UNIX_DIAG_SHUTDOWN,
 
-       UNIX_DIAG_MAX,
+       __UNIX_DIAG_MAX,
 };
 
+#define UNIX_DIAG_MAX (__UNIX_DIAG_MAX - 1)
+
 struct unix_diag_vfs {
        __u32   udiag_vfs_ino;
        __u32   udiag_vfs_dev;
-- 
1.8.1.4

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