How much of the Linux kernel is currently coded in rust?

Its a curiosity thing, but I would like to know How much of the Linux kernel is currently coded in rust ? I means in percent, and if you known it which part ? is there only drivers or is it real part of the kernel in pure rust ? NB : from the github.com/torvalds/linux page there is a statistic that report no rust. C 98.3% Assembly 0.7% Shell 0.4% Makefile 0.2% Python 0.2% Perl 0.1% Other 0.1%