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commit edb6f29464 upstream.
This affects xen pv guests with sufficiently old versions of xen and
sufficiently new hardware. On such a system, a guest with a btrfs
root won't even boot.
Signed-off-by: John Haxby <john.haxby@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reported-by: Michael Marineau <michael.marineau@coreos.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>