hw/display/qxl.c: Use trace_event_get_state_backends()

The preferred way to test whether a trace event is enabled is to
use trace_event_get_state_backends(), because this will give the
correct answer (allowing expensive computations to be skipped)
whether the trace event is compile-time or run-time disabled.
Convert the old-style direct use of TRACE_FOO_ENABLED.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200120151142.18954-4-peter.maydell@linaro.org
Message-Id: <20200120151142.18954-4-peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 944c02c..c33b191 100644 (file)
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1764,7 +1764,7 @@ async_common:
         qxl_set_mode(d, val, 0);
         break;
     case QXL_IO_LOG:
-        if (TRACE_QXL_IO_LOG_ENABLED || d->guestdebug) {
+        if (trace_event_get_state_backends(TRACE_QXL_IO_LOG) || d->guestdebug) {
             /* We cannot trust the guest to NUL terminate d->ram->log_buf */
             char *log_buf = g_strndup((const char *)d->ram->log_buf,
                                       sizeof(d->ram->log_buf));