From: "Steven Rostedt (VMware)" <rost...@goodmis.org>
When the CONFIG_RING_BUFFER_VALIDATE_TIME_DELTAS is enabled, and the time
stamps are detected as not being valid, it reports information about the
write stamp, but does not show the before_stamp which is still useful
information. Also, it should give a warning once, such that tests detect
this happening.
Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org>
---
kernel/trace/ring_buffer.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 342f49c3ccc5..68744c51517e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -3318,9 +3318,13 @@ static void check_buffer(struct ring_buffer_per_cpu
*cpu_buffer,
goto out;
}
atomic_inc(&cpu_buffer->record_disabled);
- pr_warn("[CPU: %d]TIME DOES NOT MATCH expected:%lld actual:%lld
delta:%lld after:%lld\n",
- cpu_buffer->cpu,
- ts + info->delta, info->ts, info->delta, info->after);
+ /* There's some cases in boot up that this can happen */
+ WARN_ON_ONCE(system_state != SYSTEM_BOOTING);
+ pr_warn("[CPU: %d]TIME DOES NOT MATCH expected:%lld actual:%lld
delta:%lld before:%lld after:%lld%s\n",
+ cpu_buffer->cpu,
+ ts + info->delta, info->ts, info->delta,
+ info->before, info->after,
+ full ? " (full)" : "");
dump_buffer_page(bpage, info, tail);
atomic_dec(&ts_dump);
/* Do not re-enable checking */
--
2.30.0
