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tracing/synthetic: Fix trace_string() return value

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Fix trace_string() by assigning the string length to the return variable
which got lost in commit ddeea494a1 ("tracing/synthetic: Use union
instead of casts") and caused trace_string() to always return 0.

Link: https://lore.kernel.org/linux-trace-kernel/20240214220555.711598-1-thorsten.blum@toblux.com

Cc: stable@vger.kernel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fixes: ddeea494a1 ("tracing/synthetic: Use union instead of casts")
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Thorsten Blum 2024-02-14 23:05:56 +01:00 committed by Steven Rostedt (Google)
parent 2394ac4145
commit 9b6326354c
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_events_synth.c
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@ -441,8 +441,9 @@ static unsigned int trace_string(struct synth_trace_event *entry,
if (is_dynamic) {
union trace_synth_field *data = &entry->fields[*n_u64];
len = fetch_store_strlen((unsigned long)str_val);
data->as_dynamic.offset = struct_size(entry, fields, event->n_u64) + data_size;
data->as_dynamic.len = fetch_store_strlen((unsigned long)str_val);
data->as_dynamic.len = len;
ret = fetch_store_string((unsigned long)str_val, &entry->fields[*n_u64], entry);