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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Fri, 20 Apr 2012 23:01:36 +0000 (UTC)
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Subject: svn commit: r234517 - head/sys/powerpc/aim
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Author: nwhitehorn
Date: Fri Apr 20 23:01:36 2012
New Revision: 234517
URL: http://svn.freebsd.org/changeset/base/234517

Log:
  Make sure all pending operations have completed on the existing thread
  before (potentially) migrating it to a different CPU.
  
  MFC after:	5 days

Modified:
  head/sys/powerpc/aim/swtch32.S
  head/sys/powerpc/aim/swtch64.S

Modified: head/sys/powerpc/aim/swtch32.S
==============================================================================
--- head/sys/powerpc/aim/swtch32.S	Fri Apr 20 23:00:37 2012	(r234516)
+++ head/sys/powerpc/aim/swtch32.S	Fri Apr 20 23:01:36 2012	(r234517)
@@ -113,6 +113,7 @@ ENTRY(cpu_switch)
 	mr	%r3,%r14		/* restore old thread ptr */
 	bl	pmap_deactivate		/* Deactivate the current pmap */
 
+	sync				/* Make sure all of that finished */
 	stw	%r16,TD_LOCK(%r14)	/* ULE:	update old thread's lock */
 
 cpu_switchin:

Modified: head/sys/powerpc/aim/swtch64.S
==============================================================================
--- head/sys/powerpc/aim/swtch64.S	Fri Apr 20 23:00:37 2012	(r234516)
+++ head/sys/powerpc/aim/swtch64.S	Fri Apr 20 23:01:36 2012	(r234517)
@@ -139,6 +139,7 @@ ENTRY(cpu_switch)
 
 	addi	%r1,%r1,48
 
+	sync				/* Make sure all of that finished */
 	std	%r16,TD_LOCK(%r14)	/* ULE:	update old thread's lock */
 
 cpu_switchin: