svn commit: r197643 - in head/sys: kern sys

[Ivan Voras]

2009/9/30 Attilio Rao <attilio at freebsd.org>:
> Author: attilio
> Date: Wed Sep 30 13:26:31 2009
> New Revision: 197643
> URL: http://svn.freebsd.org/changeset/base/197643
>
> Log:
>  When releasing a read/shared lock we need to use a write memory barrier
>  in order to avoid, on architectures which doesn't have strong ordered
>  writes, CPU instructions reordering.

Will this influence performance on those architecture that do?