[PATCH v3 1/1] monitor/hmp: print trace as option in help for log command

[Dongli Zhang <dongli.zhang@oracle.com>]

The below is printed when printing help information in qemu-system-x86_64
command line, and when CONFIG_TRACE_LOG is enabled:

----------------------------
$ qemu-system-x86_64 -d help
... ...
trace:PATTERN   enable trace events

Use "-d trace:help" to get a list of trace events.
----------------------------

However, the options of "trace:PATTERN" are only printed by
"qemu-system-x86_64 -d help", but missing in hmp "help log" command.

Fixes: c84ea00dc2 ("log: add "-d trace:PATTERN"")
Cc: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
---
Changed since v1:
- change format for "none" as well.
Changed since v2:
- use "log trace:help" in help message.
- add more clarification in commit message.
- add 'Fixes' tag.
---
 monitor/hmp.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/monitor/hmp.c b/monitor/hmp.c
index 15ca04735c..a3375d0341 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -285,10 +285,15 @@ void help_cmd(Monitor *mon, const char *name)
         if (!strcmp(name, "log")) {
             const QEMULogItem *item;
             monitor_printf(mon, "Log items (comma separated):\n");
-            monitor_printf(mon, "%-10s %s\n", "none", "remove all logs");
+            monitor_printf(mon, "%-15s %s\n", "none", "remove all logs");
             for (item = qemu_log_items; item->mask != 0; item++) {
-                monitor_printf(mon, "%-10s %s\n", item->name, item->help);
+                monitor_printf(mon, "%-15s %s\n", item->name, item->help);
             }
+#ifdef CONFIG_TRACE_LOG
+            monitor_printf(mon, "trace:PATTERN   enable trace events\n");
+            monitor_printf(mon, "\nUse \"log trace:help\" to get a list of "
+                           "trace events.\n\n");
+#endif
             return;
         }
 
-- 
2.17.1