Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5)

[H. Peter Anvin]

Mathieu Desnoyers wrote:
> Just to be clear : the added cost on normal interrupt return is to add a
> supplementary test of the thread flags already loaded in registers and
> a conditional branch. This is used to detect if we are nested over an
> NMI handler. I doubt anyone ever notice an impact caused by this added
> test/branch.

Why the **** would you do this except in the handful of places where you 
actually *could* be nested over an NMI handler (basically #MC, #DB and 
INT3)?

	-hpa

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