Extern or forward variable declaration at drivers/block/xen-blkback/common.h, line 235 References: drivers/block/xen-blkback/common.h, line 235 drivers/block/xen-blkback/common.h, line 272 drivers/block/xen-blkback/common.h, line 381 drivers/block/xen-blkback/common.h, line 384 drivers/block/xen-blkback/common.h, line 385 drivers/block/xen-blkback/xenbus.c, line 24 drivers/block/xen-blkback/xenbus.c, line 34 drivers/block/xen-blkback/xenbus.c, line 35 drivers/block/xen-blkback/xenbus.c, line 39 drivers/block/xen-blkback/xenbus.c, line 302 drivers/block/xen-blkback/xenbus.c, line 425 drivers/block/xen-blkback/xenbus.c, line 452 drivers/block/xen-blkback/xenbus.c, line 465 drivers/block/xen-blkback/xenbus.c, line 505 drivers/block/xen-blkback/xenbus.c, line 527 drivers/block/xen-blkback/xenbus.c, line 527 drivers/block/xen-blkback/xenbus.c, line 577 drivers/block/xen-blkback/xenbus.c, line 578 drivers/block/xen-blkback/xenbus.c, line 661 drivers/block/xen-blkback/xenbus.c, line 727 drivers/block/xen-blkback/xenbus.c, line 810