Re: [RFC PATCH for 4.18] rseq: use __u64 for rseq_cs fields, validate user inputs

From: Andi Kleen
Date: Tue Jul 03 2018 - 12:41:00 EST

> So I think you're good... But yes, you raise an interresting point.

So it sounds like architectures that don't have an instruction atomic u64
*_user need to disable interrupts during the access, and somehow handle that
case when a page fault happens?