scsi: iscsi: tracing: Use the new __vstring() helper

Instead of open coding a __dynamic_array() with a fixed length (which
defeats the purpose of the dynamic array in the first place). Use the new
__vstring() helper that will use a va_list and only write enough of the
string into the ring buffer that is needed.

Link: https://lkml.kernel.org/r/20220705224750.715763972@goodmis.org
Cc: Fred Herard <fred.herard@oracle.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/include/trace/events/iscsi.h b/include/trace/events/iscsi.h
index 87408fa..8ff2a3c 100644 (file)
--- a/include/trace/events/iscsi.h
+++ b/include/trace/events/iscsi.h
@@ -26,12 +26,12 @@ DECLARE_EVENT_CLASS(iscsi_log_msg,
 
        TP_STRUCT__entry(
                __string(dname,         dev_name(dev)           )
-               __dynamic_array(char,   msg, ISCSI_MSG_MAX      )
+               __vstring(msg,          vaf->fmt, vaf->va)
        ),
 
        TP_fast_assign(
                __assign_str(dname, dev_name(dev));
-               vsnprintf(__get_str(msg), ISCSI_MSG_MAX, vaf->fmt, *vaf->va);
+               __assign_vstr(msg, vaf->fmt, vaf->va);
        ),
 
        TP_printk("%s: %s",__get_str(dname),  __get_str(msg)