Linus Torvalds rarely writes significant amounts of kernel code these days, so
the merging
of a 48-part patch series from him is an unusual event.  This series,
destined for the 7.4 kernel release, performs some long-delayed kernel
cleanup by removing a couple of the primitives used to access user-space memory
from the kernel.  What was once a best practice has long been superseded,
but it can take time for such changes to work their way through a body of
code this large.

https://lwn.net/Articles/1102061/
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