Re: [PATCH] aio: use cmpxchg in aio_read_evt() instead of aio_ring_info->ring_lock

[Zach Brown]

Nikanth Karthikesan wrote:
> Use cmpxchg in aio_read_evt() and remove the aio_ring_info->ring_lock

I don't think this is safe because the cmpxhg() can't differentiate the
0 it read at one point with a 0 that it reads in the future after other
racing threads have done enough work on the ring index to wrap it.

- z
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