Re: [patch 6/8] x86/entry: Move irq tracing to syscall_slow_exit_work

Andy Lutomirski
2020-02-26T05:47:55Z

On 2/25/20 2:08 PM, Thomas Gleixner wrote:
> which removes the ASM IRQ tracepoints.

It's still after we re-enter rcuidle. Is tracing actually okay?

I always had the impression that tracing was okay in rcuidle mode
because the tracing code was smart enough to do the right thing, but
your patch 3/8 changelog says:

Anything before enter_from_user_mode() is not safe to be traced or probed.

--Andy