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-rw-r--r--sys/xen/interface/grant_table.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/xen/interface/grant_table.h b/sys/xen/interface/grant_table.h
index 26f2c35..e76ca67 100644
--- a/sys/xen/interface/grant_table.h
+++ b/sys/xen/interface/grant_table.h
@@ -159,6 +159,8 @@ typedef struct grant_entry grant_entry_t;
*/
typedef uint32_t grant_ref_t;
+#define GRANT_REF_INVALID 0xffffffff
+
/*
* Handle to track a mapping created via a grant reference.
*/
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