I compile the QEMU source download from qemu.git (http://git.qemu.org/git/qemu.git) on 4-9-2013, errors reported as below,
hw/virtio/dataplane/vring.c: In function 'vring_enable_notification': hw/virtio/dataplane/vring.c:72: warning: implicit declaration of function 'vring_avail_event' hw/virtio/dataplane/vring.c:72: warning: nested extern declaration of 'vring_avail_event' hw/virtio/dataplane/vring.c:72: error: lvalue required as left operand of assignment hw/virtio/dataplane/vring.c: In function 'vring_should_notify': hw/virtio/dataplane/vring.c:107: warning: implicit declaration of function 'vring_need_event' hw/virtio/dataplane/vring.c:107: warning: nested extern declaration of 'vring_need_event' hw/virtio/dataplane/vring.c:107: warning: implicit declaration of function 'vring_used_event' hw/virtio/dataplane/vring.c:107: warning: nested extern declaration of 'vring_used_event' hw/virtio/dataplane/vring.c: In function 'vring_pop': hw/virtio/dataplane/vring.c:262: error: lvalue required as left operand of assignment make: *** [hw/virtio/dataplane/vring.o] Error 1 'vring_avail_event' and 'vring_need_event' defined in /linux-headers/linux/virtio_ring.h, are not available in vring.c ?
