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tracing: Add the bucket size to expr_field_str()

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expr_field_str() renders a HIST_FIELD_FL_BUCKET field as "pid.buckets",
dropping the count, and parse_field() rejects that spelling.

get_hist_field_flags() returns the bare string "buckets" and keeps the
count in hist_field->buckets. hist_field_print() appends it,
expr_field_str() never did. Nothing reaches it today, since .buckets is
refused on a value and no expression can carry one, but the next patch
renders histogram keys with expr_field_str(), where a .buckets key is
legal.

Append the count, as hist_field_print() does.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260914053443.981201-3-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 14:34:41 +09:00 committed by Steven Rostedt
parent 387945e8d2
commit c027ed03bc
1 changed files with 3 additions and 0 deletions
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3
kernel/trace/trace_events_hist.c
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@ -1754,6 +1754,9 @@ static bool expr_field_str(struct hist_field *field, struct seq_buf *s)
seq_buf_printf(s, ".%s", flags_str);
}
if (field->buckets)
seq_buf_printf(s, "=%lu", field->buckets);
return !seq_buf_has_overflowed(s);
}