Juergen Gross writes ("Re: [PATCH 3/3] xen: Document
XEN_SYSCTL_CPUPOOL_OP_RMCPU anomalous EBUSY result"):
> On 15/04/16 16:12, Ian Jackson wrote:
> > Does the hypervisor currently use EAGAIN for anything ?
>
> Yes. Especially XEN_SYSCTL_CPUPOOL_OP_RMCPU can return it already.
That is a good reason not to use it.
> Before you are asking: Jan didn't want it to return EAGAIN in the
> temporary pinning case as the hypervisor couldn't guarantee that
> the situation will be resolved (opposed to the other usage of
> EAGAIN).
Hrm. I note that ENOLCK is in the list in errno.h but not used
anywhere. EISCONN is another possibility...
Ian.
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