tree d6e1828f08344fa7f183ea9deddb8b898b26d5ab
parent 604c499cbbcc3d5fe5fb8d53306aa0fae1990109
author Jan Beulich <jbeulich@suse.com> 1371496593 -0400
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1371496635 -0400

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>