From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Juergen Gross <jgross@suse.com>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH v3] xen/events: remove event handling recursion detection
Date: Fri, 29 Nov 2019 20:11:47 -0500 [thread overview]
Message-ID: <6b15f9b5-744e-1bb2-d4a2-6ce4fc745d64@oracle.com> (raw)
In-Reply-To: <20191129123941.11975-1-jgross@suse.com>
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@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
prev parent reply other threads:[~2019-11-30 1:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-29 12:39 Juergen Gross
2019-11-30 1:11 ` Boris Ostrovsky [this message]
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