From: Jan Beulich <jbeulich@suse.com>
Date: Mon, 17 Jun 2013 19:16:33 +0000 (-0400)
Subject: xen/io/ring.h: new macro to detect whether there are too many requests on the ring
X-Git-Tag: v3.11-rc3~32^2~9^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d9256906a97c24e97e016482b9be06ea2532b05;p=pandora-kernel.git

xen/io/ring.h: new macro to detect whether there are too many requests on the ring

Backends may need to protect themselves against an insane number of
produced requests stored by a frontend, in case they iterate over
requests until reaching the req_prod value. There can't be more
requests on the ring than the difference between produced requests
and produced (but possibly not yet published) responses.

This is a more strict alternative to a patch previously posted by
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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