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

-Andi

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