tree c0326022d8ccf711afb495c9c556447dfcf845b7
parent a953be53ce40440acb4740edb48577b9468d4c3d
author Michael Dalton <mwdalton@google.com> 1389939809 -0800
committer David S. Miller <davem@davemloft.net> 1389944766 -0800

lib: Ensure EWMA does not store wrong intermediate values

To ensure ewma_read() without a lock returns a valid but possibly
out of date average, modify ewma_add() by using ACCESS_ONCE to prevent
intermediate wrong values from being written to avg->internal.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Michael Dalton <mwdalton@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>