Re: [PATCH 1/5] arm64: entry: isb in el1_irq

From: James Morse
Date: Fri Apr 06 2018 - 13:33:47 EST


Hi Mark,

On 06/04/18 18:22, Mark Rutland wrote:
> Digging a bit, I also thing that our ct_user_exit and ct_user_enter
> usage is on dodgy ground today.

[...]

> I think similar applies to SDEI; we don't negotiate with RCU prior to
> invoking handlers, which might need RCU.

The arch code's __sdei_handler() calls nmi_enter() -> rcu_nmi_enter(), which
does a rcu_dynticks_eqs_exit().


Thanks,

James