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virtio_ring: document alignment requirements
authorMichael S. Tsirkin <mst@redhat.com>
Thu, 25 Dec 2014 14:03:27 +0000 (16:03 +0200)
committerMichael S. Tsirkin <mst@redhat.com>
Mon, 29 Dec 2014 08:54:54 +0000 (10:54 +0200)
commitb28e0506fafd9c987bba7a6a71ea02a37fcabdea
treed106164f315a92e8894454fdf93226bff5f53d3etree | snapshot (tar.gz zip)
parentb7392d2247cfe6771f95d256374f1a8e6a6f48d6commit | diff
virtio_ring: document alignment requirements

Host needs to know vring element alignment requirements:
simply doing alignof on structures doesn't work reliably: on some
platforms gcc has alignof(uint32_t) == 2.

Add macros for alignment as specified in virtio 1.0 cs01,
export them to userspace as well.

Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
include/uapi/linux/virtio_ring.h diff | blob | blame | history