[PATCH 0/4] vhost: Cleanup

[Gavin Shan]

This is suggested by Michael S. Tsirkin according to [1] and the goal
is to apply smp_rmb() inside vhost_get_avail_idx() if needed. With it,
the caller of the function needn't to worry about memory barriers. Since
we're here, other cleanups are also applied.

[1] https://lore.kernel.org/virtualization/20240327075940-mutt-send-email-mst@xxxxxxxxxx/

PATCH[1] drops the local variable @last_avail_idx since it's equivalent
         to vq->last_avail_idx
PATCH[2] improves vhost_get_avail_idx() so that smp_rmb() is applied if
         needed. Besides, the sanity checks on the retrieved available
         queue index are also squeezed to vhost_get_avail_idx()
PATCH[3] improves vhost_get_avail_head(), similar to what we're doing
         for vhost_get_avail_idx(), so that the relevant sanity checks
         on the head are squeezed to vhost_get_avail_head()
PATCH[4] Reformat vhost_{get, put}_user() by using tab instead of space
         as the terminator for each line

Gavin Shan (4):
  vhost: Drop variable last_avail_idx in vhost_get_vq_desc()
  vhost: Improve vhost_get_avail_idx() with smp_rmb()
  vhost: Improve vhost_get_avail_head()
  vhost: Reformat vhost_{get, put}_user()

 drivers/vhost/vhost.c | 199 +++++++++++++++++++-----------------------
 1 file changed, 88 insertions(+), 111 deletions(-)

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2.44.0