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tracing: Print the bucket size as unsigned

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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.

Link: https://patch.msgid.link/20260914053443.981201-2-donggeunyoo.kernel@gmail.com
Fixes: de9a48a360 ("tracing: Add linear buckets to histogram logic")
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Assisted-by: Claude:claude-fable-5
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Donggeun Yoo 2026-09-14 14:34:40 +09:00 committed by Steven Rostedt
parent c28bf729dd
commit 387945e8d2
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_events_hist.c
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@ -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,