Re: [PATCH v3 3/4] uaccess: Check no rescheduling function is called in unsafe region

[Peter Zijlstra]

On Wed, Feb 13, 2019 at 03:40:00PM +0100, Peter Zijlstra wrote:

> So far, all 6 in-tree users are indeed free of dodgy code, but *groan*.

because of this, there must also not be tracepoints (even implicit ones
like function-trace) between user_access_{begin,end}().

And while that is unlikely with the current code; it is not guaranteed
afaict.

What a ff'ing mess.