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What previous "bad IPC" mechanisms were integrated into mainline Linux? Only one I can think of is sysv shared memory.

All of them :)

Pipes are too specialized, localSockets are kind of a pain, etc.

Most recently, kdbus. It wasn't even ABI-compatible.

kdbus was never merged to mainline.

Maybe that's why it's Bad :?

Sorry, I took 'integrated' to mean something other than merged. No, kdbus was never part of the kernel repo.