[PATCH v5 1/2] serial: qcom-geni: trace: Drop redundant len field from geni_serial_data

[Praveen Talari]

The dynamic array stored in the ring buffer already carries its own
length in the array metadata. There is no need to also store it as a
separate scalar field in the entry struct.

Drop __field(unsigned int, len) and the corresponding __entry->len
assignment, and use __get_dynamic_array_len(data) in the TP_printk for
both the len=%u format argument and the __print_hex() size argument.
This saves 4 bytes per event on the ring buffer.

Signed-off-by: Praveen Talari <praveen.talari@xxxxxxxxxxxxxxxx>
---
 include/trace/events/qcom_geni_serial.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/trace/events/qcom_geni_serial.h b/include/trace/events/qcom_geni_serial.h
index 417ec01f9fc8..e1aa551d525e 100644
--- a/include/trace/events/qcom_geni_serial.h
+++ b/include/trace/events/qcom_geni_serial.h
@@ -97,18 +97,17 @@ DECLARE_EVENT_CLASS(geni_serial_data,
 		    TP_ARGS(dev, buf, len),
 
 		    TP_STRUCT__entry(__string(name, dev_name(dev))
-				     __field(unsigned int, len)
 				     __dynamic_array(u8, data, len)
 		    ),
 
 		    TP_fast_assign(__assign_str(name);
-				   __entry->len = len;
 				   memcpy(__get_dynamic_array(data), buf, len);
 		    ),
 
 		    TP_printk("%s: len=%u data=%s",
-			      __get_str(name), __entry->len,
-			      __print_hex(__get_dynamic_array(data), __entry->len))
+			      __get_str(name), __get_dynamic_array_len(data),
+			      __print_hex(__get_dynamic_array(data),
+					  __get_dynamic_array_len(data)))
 );
 
 DEFINE_EVENT(geni_serial_data, geni_serial_tx_data,

-- 
2.34.1