From: Michael Dalton <mwdalton@google.com>
Date: Fri, 17 Jan 2014 06:23:29 +0000 (-0800)
Subject: lib: Ensure EWMA does not store wrong intermediate values
X-Git-Tag: v3.14-rc1~94^2~114^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=03144b5869d2921dafbea477246aeb5d4eb5fc38;p=pandora-kernel.git

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out of date average, modify ewma_add() by using ACCESS_ONCE to prevent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>
---

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