tree 6a27622d96f5327408c75b914c3a54120dc1d866
parent 3a35ce7dcefe9e80a00603a195269fbaf6e7d901
author Rusty Russell <rusty@rustcorp.com.au> 1238471722 -0600
committer Rusty Russell <rusty@rustcorp.com.au> 1238412323 +1030

virtio: more neatening of virtio_ring macros.

Impact: cleanup

Roel Kluin drew attention to these macros with his patch: here I
neaten them a little further:
1) Add a comment on what START_USE and END_USE are checking,
2) Brackets around _vq in BAD_RING,
3) Neaten formatting for START_USE so it's less than 80 cols.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>