From: Thorsten Blum Date: Wed, 14 Feb 2024 22:05:56 +0000 (+0100) Subject: tracing/synthetic: Fix trace_string() return value X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=9b6326354cf9a41521b79287da3bfab022ae0b6d;p=people%2Faperard%2Flinux.git tracing/synthetic: Fix trace_string() return value Fix trace_string() by assigning the string length to the return variable which got lost in commit ddeea494a16f ("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 Fixes: ddeea494a16f ("tracing/synthetic: Use union instead of casts") Acked-by: Masami Hiramatsu (Google) Signed-off-by: Thorsten Blum Signed-off-by: Steven Rostedt (Google) --- diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c index e7af286af4f1a..c82b401a294d9 100644 --- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -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);