1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 8a60e7766037..a3aa9e9ef6f2 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -426,6 +426,9 @@ enum vmbus_channel_message_type {
         CHANNELMSG_COUNT
 };
 
+/* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */
+#define INVALID_RELID   U32_MAX
+
 struct vmbus_channel_message_header {
         enum vmbus_channel_message_type msgtype;
         u32 padding;