svn commit: r234704 - stable/9/sys/powerpc/aim

[Nathan Whitehorn]

Author: nwhitehorn
Date: Thu Apr 26 13:56:38 2012
New Revision: 234704
URL: http://svn.freebsd.org/changeset/base/234704

Log:
  MFC r234517:
  Make sure all pending operations have completed on the existing thread
  before (potentially) migrating it to a different CPU.

Modified:
  stable/9/sys/powerpc/aim/swtch32.S
  stable/9/sys/powerpc/aim/swtch64.S
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/powerpc/aim/swtch32.S
==============================================================================
--- stable/9/sys/powerpc/aim/swtch32.S	Thu Apr 26 13:55:15 2012	(r234703)
+++ stable/9/sys/powerpc/aim/swtch32.S	Thu Apr 26 13:56:38 2012	(r234704)
@@ -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: stable/9/sys/powerpc/aim/swtch64.S
==============================================================================
--- stable/9/sys/powerpc/aim/swtch64.S	Thu Apr 26 13:55:15 2012	(r234703)
+++ stable/9/sys/powerpc/aim/swtch64.S	Thu Apr 26 13:56:38 2012	(r234704)
@@ -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: