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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 14 Jul 2010 19:00:44 +0000 (UTC)
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Subject: svn commit: r210072 - stable/8/sys/kern
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Author: jhb
Date: Wed Jul 14 19:00:44 2010
New Revision: 210072
URL: http://svn.freebsd.org/changeset/base/210072

Log:
  MFC 208787:
  Assert that the thread lock is held in sched_pctcpu() instead of
  recursively acquiring it.  All of the current callers already hold the
  lock.

Modified:
  stable/8/sys/kern/sched_4bsd.c
  stable/8/sys/kern/sched_ule.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/kern/sched_4bsd.c
==============================================================================
--- stable/8/sys/kern/sched_4bsd.c	Wed Jul 14 18:55:45 2010	(r210071)
+++ stable/8/sys/kern/sched_4bsd.c	Wed Jul 14 19:00:44 2010	(r210072)
@@ -1523,6 +1523,7 @@ sched_pctcpu(struct thread *td)
 {
 	struct td_sched *ts;
 
+	THREAD_LOCK_ASSERT(td, MA_OWNED);
 	ts = td->td_sched;
 	return (ts->ts_pctcpu);
 }

Modified: stable/8/sys/kern/sched_ule.c
==============================================================================
--- stable/8/sys/kern/sched_ule.c	Wed Jul 14 18:55:45 2010	(r210071)
+++ stable/8/sys/kern/sched_ule.c	Wed Jul 14 19:00:44 2010	(r210072)
@@ -2367,7 +2367,7 @@ sched_pctcpu(struct thread *td)
 	if (ts == NULL)
 		return (0);
 
-	thread_lock(td);
+	THREAD_LOCK_ASSERT(td, MA_OWNED);
 	if (ts->ts_ticks) {
 		int rtick;
 
@@ -2376,7 +2376,6 @@ sched_pctcpu(struct thread *td)
 		rtick = min(SCHED_TICK_HZ(ts) / SCHED_TICK_SECS, hz);
 		pctcpu = (FSCALE * ((FSCALE * rtick)/hz)) >> FSHIFT;
 	}
-	thread_unlock(td);
 
 	return (pctcpu);
 }