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Re: [PATCH 3/3] hw/display/qxl.c: Use trace_event_get_state_backends()
From: |
Gerd Hoffmann |
Subject: |
Re: [PATCH 3/3] hw/display/qxl.c: Use trace_event_get_state_backends() |
Date: |
Tue, 21 Jan 2020 06:54:46 +0100 |
On Mon, Jan 20, 2020 at 03:11:42PM +0000, Peter Maydell wrote:
> 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 <address@hidden>
> ---
> hw/display/qxl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/display/qxl.c b/hw/display/qxl.c
> index 6d43b7433cf..80a4dcc40e4 100644
> --- 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) {
Acked-by: Gerd Hoffmann <address@hidden>
> /* 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));
> --
> 2.20.1
>