[PATCH 18/20] trace: stop tracking static disabled state

["Daniel P. Berrangé" <berrange@redhat.com>]

The TraceEvent struct contains a "bool sstate" field which track whether
a trace event was disabled statically. i.e. at build time via the
"disable" property annotation in trace-events.

The only runtime use of this field is to let "trace-event-get-state"
report that an event is "unavailable" instead of reporting an error for
an unknown trace event.

Trace events are not ABI so their names can change and the event can
come and go at any time. Thus there is little utility in reporting the
existence of a disabled event that cannot ever be used at runtime.

Removing the "bool sstate" field from TraceEvent saves 8 bytes of
space in the struct, adding up to approx 64 KB across all current
events.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 qapi/trace.json               |  5 ++--
 scripts/tracetool/format/c.py |  2 --
 scripts/tracetool/format/h.py |  8 ------
 stubs/trace-control.c         |  1 -
 tests/tracetool/all.c         |  2 --
 tests/tracetool/all.h         | 14 +++++------
 tests/tracetool/dtrace.c      |  2 --
 tests/tracetool/dtrace.h      |  2 --
 tests/tracetool/ftrace.c      |  2 --
 tests/tracetool/ftrace.h      |  6 ++---
 tests/tracetool/log.c         |  2 --
 tests/tracetool/log.h         |  6 ++---
 tests/tracetool/nop.h         |  2 --
 tests/tracetool/simple.c      |  2 --
 tests/tracetool/simple.h      |  2 --
 tests/tracetool/syslog.c      |  2 --
 tests/tracetool/syslog.h      |  6 ++---
 tests/tracetool/ust.c         |  2 --
 tests/tracetool/ust.h         |  2 --
 trace/control-internal.h      |  6 -----
 trace/control-target.c        |  2 --
 trace/control.c               |  9 -------
 trace/control.h               | 18 +++-----------
 trace/event-internal.h        |  2 --
 trace/qmp.c                   | 47 ++++++++++-------------------------
 25 files changed, 30 insertions(+), 124 deletions(-)

diff --git a/qapi/trace.json b/qapi/trace.json
index de369dae6b5..a5aaf2cab0e 100644
--- a/qapi/trace.json
+++ b/qapi/trace.json
@@ -17,8 +17,6 @@
 #
 # State of a tracing event.
 #
-# @unavailable: The event is statically disabled.
-#
 # @disabled: The event is dynamically disabled.
 #
 # @enabled: The event is dynamically enabled.
@@ -26,7 +24,7 @@
 # Since: 2.2
 ##
 { 'enum': 'TraceEventState',
-  'data': ['unavailable', 'disabled', 'enabled'] }
+  'data': ['disabled', 'enabled'] }
 
 ##
 # @TraceEventInfo:
@@ -73,6 +71,7 @@
 # @enable: Whether to enable tracing.
 #
 # @ignore-unavailable: Do not match unavailable events with @name.
+#      Deprecated: since 11.2
 #
 # Since: 2.2
 #
diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
index 5f6669c917c..9f06894623e 100644
--- a/scripts/tracetool/format/c.py
+++ b/scripts/tracetool/format/c.py
@@ -39,12 +39,10 @@ def generate(events, backend, group):
                 '    .id = 0,',
                 '#endif',
                 '    .name = \"%(name)s\",',
-                '    .sstate = %(sstate)s,',
                 '    .dstate = &%(dstate)s',
                 '};',
                 event = e.api(e.QEMU_EVENT),
                 name = e.name,
-                sstate = "TRACE_%s_ENABLED" % e.name.upper(),
                 dstate = e.api(e.QEMU_DSTATE))
 
         out('TraceEvent *%(group)s_trace_events[] = {',
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 6ffb7256e31..3ca92ba5fbe 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -38,14 +38,6 @@ def generate(events, backend, group):
         for e in events:
             out('#define %s 0' % e.api(e.QEMU_DSTATE))
 
-    # static state
-    for e in events:
-        if 'disable' in e.properties:
-            enabled = 0
-        else:
-            enabled = 1
-        out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
-
     backend.generate_begin(events, group)
 
     for e in events:
diff --git a/stubs/trace-control.c b/stubs/trace-control.c
index 3f196835db0..6016307ed8b 100644
--- a/stubs/trace-control.c
+++ b/stubs/trace-control.c
@@ -14,7 +14,6 @@
 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
 {
     bool state_pre;
-    assert(trace_event_get_state_static(ev));
 
     /*
      * We ignore the "vcpu" property here, since there's no target code. Then
diff --git a/tests/tracetool/all.c b/tests/tracetool/all.c
index 3b8d4d32d17..670f9f06e85 100644
--- a/tests/tracetool/all.c
+++ b/tests/tracetool/all.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/all.h b/tests/tracetool/all.h
index a2c2d40388e..6eed86edb4d 100644
--- a/tests/tracetool/all.h
+++ b/tests/tracetool/all.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 #ifndef SDT_USE_VARIADIC
 #define SDT_USE_VARIADIC 1
 #endif
@@ -59,16 +57,16 @@ static inline void trace_test_blah(void *context, const char *filename)
     if (trace_event_get_state(TRACE_TEST_BLAH)) {
 #line 4 "trace-events"
         ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
-#line 62 "all.h"
+#line 60 "all.h"
         if (qemu_loglevel_mask(LOG_TRACE)) {
 #line 4 "trace-events"
             qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
-#line 66 "all.h"
+#line 64 "all.h"
         }
         _simple_trace_test_blah(context, filename);
 #line 4 "trace-events"
         syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
-#line 71 "all.h"
+#line 69 "all.h"
     }
 }
 
@@ -89,16 +87,16 @@ static inline void trace_test_wibble(void *context, int value)
     if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
 #line 5 "trace-events"
         ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
-#line 91 "all.h"
+#line 89 "all.h"
         if (qemu_loglevel_mask(LOG_TRACE)) {
 #line 5 "trace-events"
             qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
-#line 95 "all.h"
+#line 93 "all.h"
         }
         _simple_trace_test_wibble(context, value);
 #line 5 "trace-events"
         syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
-#line 100 "all.h"
+#line 98 "all.h"
     }
 }
 #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/dtrace.c b/tests/tracetool/dtrace.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/dtrace.c
+++ b/tests/tracetool/dtrace.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/dtrace.h b/tests/tracetool/dtrace.h
index 0b5b47089e8..b9283851eb0 100644
--- a/tests/tracetool/dtrace.h
+++ b/tests/tracetool/dtrace.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 #ifndef SDT_USE_VARIADIC
 #define SDT_USE_VARIADIC 1
 #endif
diff --git a/tests/tracetool/ftrace.c b/tests/tracetool/ftrace.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/ftrace.c
+++ b/tests/tracetool/ftrace.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/ftrace.h b/tests/tracetool/ftrace.h
index b34eef17d10..4eba6b4d599 100644
--- a/tests/tracetool/ftrace.h
+++ b/tests/tracetool/ftrace.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 #include "trace/ftrace.h"
 
 
@@ -24,7 +22,7 @@ static inline void trace_test_blah(void *context, const char *filename)
     if (trace_event_get_state(TRACE_TEST_BLAH)) {
 #line 4 "trace-events"
         ftrace_write("test_blah " "Blah context=%p filename=%s" "\n" , context, filename);
-#line 28 "ftrace.h"
+#line 26 "ftrace.h"
     }
 }
 
@@ -37,7 +35,7 @@ static inline void trace_test_wibble(void *context, int value)
     if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
 #line 5 "trace-events"
         ftrace_write("test_wibble " "Wibble context=%p value=%d" "\n" , context, value);
-#line 41 "ftrace.h"
+#line 39 "ftrace.h"
     }
 }
 #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/log.c b/tests/tracetool/log.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/log.c
+++ b/tests/tracetool/log.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
index fe08277887f..cf37ed3ce26 100644
--- a/tests/tracetool/log.h
+++ b/tests/tracetool/log.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 #include "qemu/log-for-trace.h"
 
 
@@ -26,7 +24,7 @@ static inline void trace_test_blah(void *context, const char *filename)
         if (qemu_loglevel_mask(LOG_TRACE)) {
 #line 4 "trace-events"
             qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
-#line 29 "log.h"
+#line 27 "log.h"
         }
     }
 }
@@ -42,7 +40,7 @@ static inline void trace_test_wibble(void *context, int value)
         if (qemu_loglevel_mask(LOG_TRACE)) {
 #line 5 "trace-events"
             qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
-#line 44 "log.h"
+#line 42 "log.h"
         }
     }
 }
diff --git a/tests/tracetool/nop.h b/tests/tracetool/nop.h
index 64b6b005684..00771577943 100644
--- a/tests/tracetool/nop.h
+++ b/tests/tracetool/nop.h
@@ -8,8 +8,6 @@
 
 #define _TRACE_TEST_BLAH_DSTATE 0
 #define _TRACE_TEST_WIBBLE_DSTATE 0
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 
 #define TRACE_TEST_BLAH_BACKEND_DSTATE() ( \
     false)
diff --git a/tests/tracetool/simple.c b/tests/tracetool/simple.c
index 3b8d4d32d17..670f9f06e85 100644
--- a/tests/tracetool/simple.c
+++ b/tests/tracetool/simple.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/simple.h b/tests/tracetool/simple.h
index 735cb21d911..9b066364b0a 100644
--- a/tests/tracetool/simple.h
+++ b/tests/tracetool/simple.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 void _simple_trace_test_blah(void *context, const char *filename);
 void _simple_trace_test_wibble(void *context, int value);
 
diff --git a/tests/tracetool/syslog.c b/tests/tracetool/syslog.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/syslog.c
+++ b/tests/tracetool/syslog.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/syslog.h b/tests/tracetool/syslog.h
index 4203b8b37dc..6a9304489f6 100644
--- a/tests/tracetool/syslog.h
+++ b/tests/tracetool/syslog.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 #include <syslog.h>
 
 
@@ -24,7 +22,7 @@ static inline void trace_test_blah(void *context, const char *filename)
     if (trace_event_get_state(TRACE_TEST_BLAH)) {
 #line 4 "trace-events"
         syslog(LOG_INFO, "test_blah " "Blah context=%p filename=%s" , context, filename);
-#line 28 "syslog.h"
+#line 26 "syslog.h"
     }
 }
 
@@ -37,7 +35,7 @@ static inline void trace_test_wibble(void *context, int value)
     if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
 #line 5 "trace-events"
         syslog(LOG_INFO, "test_wibble " "Wibble context=%p value=%d" , context, value);
-#line 41 "syslog.h"
+#line 39 "syslog.h"
     }
 }
 #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/tests/tracetool/ust.c b/tests/tracetool/ust.c
index f83d06252ea..d51ba85503a 100644
--- a/tests/tracetool/ust.c
+++ b/tests/tracetool/ust.c
@@ -12,7 +12,6 @@ TraceEvent _TRACE_TEST_BLAH_EVENT = {
     .id = 0,
 #endif
     .name = "test_blah",
-    .sstate = TRACE_TEST_BLAH_ENABLED,
     .dstate = &_TRACE_TEST_BLAH_DSTATE
 };
 TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
@@ -20,7 +19,6 @@ TraceEvent _TRACE_TEST_WIBBLE_EVENT = {
     .id = 0,
 #endif
     .name = "test_wibble",
-    .sstate = TRACE_TEST_WIBBLE_ENABLED,
     .dstate = &_TRACE_TEST_WIBBLE_DSTATE
 };
 TraceEvent *testsuite_trace_events[] = {
diff --git a/tests/tracetool/ust.h b/tests/tracetool/ust.h
index 079b2c74491..c6c5d6d7c1c 100644
--- a/tests/tracetool/ust.h
+++ b/tests/tracetool/ust.h
@@ -10,8 +10,6 @@ extern TraceEvent _TRACE_TEST_BLAH_EVENT;
 extern TraceEvent _TRACE_TEST_WIBBLE_EVENT;
 extern uint8_t _TRACE_TEST_BLAH_DSTATE;
 extern uint8_t _TRACE_TEST_WIBBLE_DSTATE;
-#define TRACE_TEST_BLAH_ENABLED 1
-#define TRACE_TEST_WIBBLE_ENABLED 1
 #include <lttng/tracepoint.h>
 #include "trace-ust-testsuite.h"
 
diff --git a/trace/control-internal.h b/trace/control-internal.h
index f626b047264..9a95e6714bb 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -33,12 +33,6 @@ static inline const char * trace_event_get_name(TraceEvent *ev)
     return ev->name;
 }
 
-static inline bool trace_event_get_state_static(TraceEvent *ev)
-{
-    assert(ev != NULL);
-    return ev->sstate;
-}
-
 /* it's on fast path, avoid consistency checks (asserts) */
 #define trace_event_get_state_dynamic_by_id(id) \
     (unlikely(trace_events_enabled_count) && _ ## id ## _DSTATE)
diff --git a/trace/control-target.c b/trace/control-target.c
index 87b0f5037df..348125a5822 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -12,8 +12,6 @@
 
 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
 {
-    assert(trace_event_get_state_static(ev));
-
     bool state_pre = *ev->dstate;
     if (state_pre != state) {
         if (state) {
diff --git a/trace/control.c b/trace/control.c
index 947b220056a..d414b1a9072 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -167,15 +167,6 @@ static void do_trace_enable_events(const char *line_buf)
 
     trace_event_iter_init_pattern(&iter, line_ptr);
     while ((ev = trace_event_iter_next(&iter)) != NULL) {
-        if (!trace_event_get_state_static(ev)) {
-            if (!is_pattern) {
-                warn_report("trace event '%s' is not traceable",
-                            line_ptr);
-                return;
-            }
-            continue;
-        }
-
         /* start tracing */
         trace_event_set_state_dynamic(ev, enable);
         if (!is_pattern) {
diff --git a/trace/control.h b/trace/control.h
index e77c07a8e68..80eb2bd14e6 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -107,13 +107,13 @@ static const char * trace_event_get_name(TraceEvent *ev);
  * impact.
  */
 #define trace_event_get_state(id)                       \
-    ((id ##_ENABLED) && trace_event_get_state_dynamic_by_id(id))
+    (trace_event_get_state_dynamic_by_id(id))
 
 /**
  * trace_event_get_state_backends:
  * @id: Event identifier name.
  *
- * Get the tracing state of an event, both static and dynamic state from all
+ * Get the tracing state of an event from all
  * compiled-in backends.
  *
  * If the event has the disabled property, the check will have no performance
@@ -123,18 +123,7 @@ static const char * trace_event_get_name(TraceEvent *ev);
  * does not have the disabled property.
  */
 #define trace_event_get_state_backends(id)              \
-    ((id ##_ENABLED) && id ##_BACKEND_DSTATE())
-
-/**
- * trace_event_get_state_static:
- * @id: Event identifier.
- *
- * Get the static tracing state of an event.
- *
- * Use the define 'TRACE_${EVENT_NAME}_ENABLED' for compile-time checks (it will
- * be set to 1 or 0 according to the presence of the disabled property).
- */
-static bool trace_event_get_state_static(TraceEvent *ev);
+    (id ##_BACKEND_DSTATE())
 
 /**
  * trace_event_get_state_dynamic:
@@ -148,7 +137,6 @@ static bool trace_event_get_state_dynamic(TraceEvent *ev);
  *
  * Set the dynamic tracing state of an event.
  *
- * Pre-condition: trace_event_get_state_static(ev) == true
  */
 void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
 
diff --git a/trace/event-internal.h b/trace/event-internal.h
index ad1578aa2c5..40f06691063 100644
--- a/trace/event-internal.h
+++ b/trace/event-internal.h
@@ -14,7 +14,6 @@
  * TraceEvent:
  * @id: Unique event identifier.
  * @name: Event name.
- * @sstate: Static tracing state.
  * @dstate: Dynamic tracing state
  *
  * Opaque generic description of a tracing event.
@@ -24,7 +23,6 @@ typedef struct TraceEvent {
     uint32_t id;
 #endif
     const char * name;
-    const bool sstate;
     uint8_t *dstate;
 } TraceEvent;
 
diff --git a/trace/qmp.c b/trace/qmp.c
index 074a27b204f..331496a1471 100644
--- a/trace/qmp.c
+++ b/trace/qmp.c
@@ -11,9 +11,10 @@
 #include "qapi/error.h"
 #include "qapi/qapi-commands-trace.h"
 #include "control.h"
+#include "qemu/error-report.h"
 
 
-static bool check_events(bool ignore_unavailable, bool is_pattern,
+static bool check_events(bool is_pattern,
                          const char *name, Error **errp)
 {
     if (!is_pattern) {
@@ -24,27 +25,8 @@ static bool check_events(bool ignore_unavailable, bool is_pattern,
             error_setg(errp, "unknown event \"%s\"", name);
             return false;
         }
-
-        /* error for unavailable event */
-        if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
-            error_setg(errp, "event \"%s\" is disabled", name);
-            return false;
-        }
-
-        return true;
-    } else {
-        /* error for unavailable events */
-        TraceEventIter iter;
-        TraceEvent *ev;
-        trace_event_iter_init_pattern(&iter, name);
-        while ((ev = trace_event_iter_next(&iter)) != NULL) {
-            if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
-                error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
-                return false;
-            }
-        }
-        return true;
     }
+    return true;
 }
 
 TraceEventInfoList *qmp_trace_event_get_state(const char *name,
@@ -56,7 +38,7 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
     bool is_pattern = trace_event_is_pattern(name);
 
     /* Check events */
-    if (!check_events(true, is_pattern, name, errp)) {
+    if (!check_events(is_pattern, name, errp)) {
         return NULL;
     }
 
@@ -68,14 +50,10 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
         value = g_new(TraceEventInfo, 1);
         value->name = g_strdup(trace_event_get_name(ev));
 
-        if (!trace_event_get_state_static(ev)) {
-            value->state = TRACE_EVENT_STATE_UNAVAILABLE;
+        if (trace_event_get_state_dynamic(ev)) {
+            value->state = TRACE_EVENT_STATE_ENABLED;
         } else {
-            if (trace_event_get_state_dynamic(ev)) {
-                value->state = TRACE_EVENT_STATE_ENABLED;
-            } else {
-                value->state = TRACE_EVENT_STATE_DISABLED;
-            }
+            value->state = TRACE_EVENT_STATE_DISABLED;
         }
         QAPI_LIST_PREPEND(events, value);
     }
@@ -91,18 +69,19 @@ void qmp_trace_event_set_state(const char *name, bool enable,
     TraceEvent *ev;
     bool is_pattern = trace_event_is_pattern(name);
 
+    if (has_ignore_unavailable && ignore_unavailable) {
+        warn_report_once("the 'ignore-unavailable' property is deprecated "
+                         "and has no effect");
+    }
+
     /* Check events */
-    if (!check_events(has_ignore_unavailable && ignore_unavailable,
-                      is_pattern, name, errp)) {
+    if (!check_events(is_pattern, name, errp)) {
         return;
     }
 
     /* Apply changes (all errors checked above) */
     trace_event_iter_init_pattern(&iter, name);
     while ((ev = trace_event_iter_next(&iter)) != NULL) {
-        if (!trace_event_get_state_static(ev)) {
-            continue;
-        }
         trace_event_set_state_dynamic(ev, enable);
     }
 }
-- 
2.55.0