The main patents have been expired for a while, no? https://en.wikipedia.org/wiki/Read-copy-update#Patents https://en.wikipedia.org/wiki/Read-copy-update#Paten

The main patents have been expired for a while, no? https://en.wikipedia.org/wiki/Read-copy-update#Patents https://en.wikipedia.org/wiki/Read-copy-update#Patents There's a lot of followup patents around optimizations, but it's probably possible to avoid those.