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

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Message-ID: <6b15f9b5-744e-1bb2-d4a2-6ce4fc745d64@oracle.com>
Date:   Fri, 29 Nov 2019 20:11:47 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH v3] xen/events: remove event handling recursion detection

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@...e.com>

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