Re: [Xen-devel] [PATCH 3/3] xen: Document XEN_SYSCTL_CPUPOOL_OP_RMCPU anomalous EBUSY result

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

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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