[PATCH v3 1/4] tracing: Print the bucket size as unsigned

[Donggeun Yoo <donggeunyoo.kernel@gmail.com>]

A key's bucket size reads back negative once it exceeds LONG_MAX:

  # echo 'hist:keys=next_pid.buckets=18446744073709551615' > trigger
  # cat trigger
  hist:keys=next_pid.buckets=-1:vals=hitcount:...

parse_field() takes the size with kstrtoul() and rejects only zero, so the
whole unsigned long range is accepted and stored, but hist_field_print()
renders it with %ld.

Print it with %lu.

Fixes: de9a48a360b7 ("tracing: Add linear buckets to histogram logic")
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Assisted-by: Claude:claude-fable-5
---
 kernel/trace/trace_events_hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 8af97fd4ee2d..a3eae5c1344a 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6200,7 +6200,7 @@ static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
 		}
 	}
 	if (hist_field->buckets)
-		seq_printf(m, "=%ld", hist_field->buckets);
+		seq_printf(m, "=%lu", hist_field->buckets);
 }
 
 static int event_hist_trigger_print(struct seq_file *m,
-- 
2.53.0