Re: [PATCH v3] xen/events: remove event handling recursion detection

[Boris Ostrovsky]

On 11/29/19 7:39 AM, Juergen Gross wrote:
> __xen_evtchn_do_upcall() contains guards against being called
> recursively. This mechanism was introduced in the early pvops times
> (kernel 2.6.26) when there were all the Xen backend drivers missing
> from the upstream kernel, and some of those out-of-tree drivers were
> enabling interrupts in their event handlers (which was explicitly
> allowed in the initial XenoLinux).
>
> Nowadays we don't need to support those old drivers any more and the
> capability to allow recursive calls of __xen_evtchn_do_upcall() can
> be removed.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>