[$] On Rust in enterprise kernels

At the recently concluded Maintainers Summit, it was generally agreed that the Rust experiment wouldcontinue, and that the path was clear for more Rust code to enter thekernel. But the high-level view taken at such gatherings cannot alwaysaccount for the difficult details that will inevitably arise as the Rustwork proceeds. A recent discussion on the nouveau mailing list may haveescaped the notice of many, but it highlights some of the problems thatwill have to be worked out as important functionality written in Rust headstoward the mainline.