Jason Donenfeld of WireGuard fame continues spending a lot of time working to clean-up Linux's RNG code. For Linux 6.1 the RNG code has seen a regression fix come around O_NONBLOCK that broke user-space some two years ago, a performance regression fix, using randomness from hardware RNGs earlier in the boot process, and a variety of other smaller changes to the RNG code that has been undergoing a lot of improvements as of late.
The full list of RNG changes for Linux 6.1 can be found via this pull request .
In somewhat related news, the crypto subsystem updates have also been submitted by Herbert Xu. On the crypto side this cycle there is an API change for feeding untrusted RNGs into /dev/random, ARS-NI/AVX/x86_64/GFNI assembler implementations of the Aria cipher, the HACE crypto driver is added for ASpeed hardware, and a variety of other changes. See this pull request for all of the crypto feature changes targeting Linux 6.1.