[PATCH 1/7] qemu-common: Briefly document qemu_timedate_diff() unit

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

It is not obvious that the qemu_timedate_diff() and
qemu_ref_timedate() functions return seconds. Briefly
document it.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/qemu-common.h | 1 +
 softmmu/vl.c          | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/qemu-common.h b/include/qemu-common.h
index d0142f29ac..e97644710c 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -27,6 +27,7 @@ int qemu_main(int argc, char **argv, char **envp);
 #endif
 
 void qemu_get_timedate(struct tm *tm, int offset);
+/* Returns difference with RTC reference time (in seconds) */
 int qemu_timedate_diff(struct tm *tm);
 
 void *qemu_oom_check(void *ptr);
diff --git a/softmmu/vl.c b/softmmu/vl.c
index f669c06ede..215459c7b5 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -737,7 +737,7 @@ void qemu_system_vmstop_request(RunState state)
 }
 
 /***********************************************************/
-/* RTC reference time/date access */
+/* RTC reference time/date access (in seconds) */
 static time_t qemu_ref_timedate(QEMUClockType clock)
 {
     time_t value = qemu_clock_get_ms(clock) / 1000;
-- 
2.21.3