When tracepoints are sent to printk() (enabled by the tp_printk boot parameter), this entry provides runtime control::
echo 0 > /proc/sys/kernel/tracepoint_printk
will stop tracepoints from being sent to printk(), and::
echo 1 > /proc/sys/kernel/tracepoint_printk
will send them to printk() again.
This only works if the kernel was booted with tp_printk enabled.
See Documentation/admin-guide/kernel-parameters.rst and Documentation/trace/boottime-trace.rst.