Re: [RFC] x86_64: A real proposal for iret-less return to kernel

[Jiri Kosina]

On Wed, 21 May 2014, H. Peter Anvin wrote:

> > I certainly like this way of handling it. We can even issue a nice
> > banner saying something like "You're f*cked - go change hw."
> 
> Actually, it would be a lot better to panic than deadlock (HA systems
> tend to have something in place to catch the panic and/or reboot).  Any
> way we can see if the CPU is already holding that lock and panic in that
> case?

Well, spin_trylock() and then either spin_unlock() and proceed sending 
the signal, otherwise panic().

-- 
Jiri Kosina
SUSE Labs
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