1 files changed, 25 insertions, 8 deletions

diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 5a14ead59696..880dd7437172 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -23,15 +23,32 @@
                 {I_REFERENCED,          "I_REFERENCED"}         \
         )
 
+/* enums need to be exported to user space */
+#undef EM
+#undef EMe
+#define EM(a,b)         TRACE_DEFINE_ENUM(a);
+#define EMe(a,b)        TRACE_DEFINE_ENUM(a);
+
 #define WB_WORK_REASON                                                  \
-                {WB_REASON_BACKGROUND,          "background"},          \
-                {WB_REASON_TRY_TO_FREE_PAGES,   "try_to_free_pages"},   \
-                {WB_REASON_SYNC,                "sync"},                \
-                {WB_REASON_PERIODIC,            "periodic"},            \
-                {WB_REASON_LAPTOP_TIMER,        "laptop_timer"},        \
-                {WB_REASON_FREE_MORE_MEM,       "free_more_memory"},    \
-                {WB_REASON_FS_FREE_SPACE,       "fs_free_space"},       \
-                {WB_REASON_FORKER_THREAD,       "forker_thread"}
+        EM( WB_REASON_BACKGROUND,               "background")           \
+        EM( WB_REASON_TRY_TO_FREE_PAGES,        "try_to_free_pages")    \
+        EM( WB_REASON_SYNC,                     "sync")                 \
+        EM( WB_REASON_PERIODIC,                 "periodic")             \
+        EM( WB_REASON_LAPTOP_TIMER,             "laptop_timer")         \
+        EM( WB_REASON_FREE_MORE_MEM,            "free_more_memory")     \
+        EM( WB_REASON_FS_FREE_SPACE,            "fs_free_space")        \
+        EMe(WB_REASON_FORKER_THREAD,            "forker_thread")
+
+WB_WORK_REASON
+
+/*
+ * Now redefine the EM() and EMe() macros to map the enums to the strings
+ * that will be printed in the output.
+ */
+#undef EM
+#undef EMe
+#define EM(a,b)         { a, b },
+#define EMe(a,b)        { a, b }
 
 struct wb_writeback_work;