ptr_ring: READ/WRITE_ONCE for __ptr_ring_empty

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Lockless __ptr_ring_empty requires that consumer head is read and
written at once, atomically. Annotate accordingly to make sure compiler
does it correctly.  Switch locked callers to __ptr_ring_peek which does
not support the lockless operation.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Michael S. Tsirkin 2018-01-26 01:36:29 +02:00 • committed by David S. Miller

parent 8619d384eb

commit a259df36d1

1 changed files with 8 additions and 3 deletions

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include/linux/ptr_ring.h

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