Broadcom device tracing

configname: CONFIG_BRCM_TRACING

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Broadcom device tracing
In linux kernel since version 3.1 (release Date: 2011-10-24)  
If you say Y here, the Broadcom wireless drivers will register
with ftrace to dump event information into the trace ringbuffer.
Tracing can be enabled at runtime to aid in debugging wireless
issues. This option adds a small amount of overhead when tracing
is disabled. If unsure, say Y to allow developers to better help
you when wireless problems occur.