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From: John Baldwin <jhb@freebsd.org>
To: current@freebsd.org
Subject: [PATCH] Switch pst(4) to callout(9)
Date: Thu, 14 Aug 2014 15:56:16 -0400
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This patch switches the pst(4) driver from timeout(9) to callout(9).  It also 
cleans up detach a bit.  The patch is against HEAD but probably applies to 9 
and 10.  Please test with INVARIANTS enabled.

http://www.FreeBSD.org/~jhb/patches/pst_callout.patch

-- 
John Baldwin