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commita9fbf4d591upstream. Commitd0380e6c3c(early_printk: consolidate random copies of identical code) added in 3.10 introduced a check for con->index == -1 in early_console_register(). Initialize index to -1 for the xenboot console so earlyprintk=xen works again. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Cc: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>