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From: Andrew Thompson <thompsa@FreeBSD.org>
Date: Thu, 29 Oct 2009 23:13:03 +0000 (UTC)
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Subject: svn commit: r198637 - in stable/8/sys: . amd64/include/xen
	cddl/contrib/opensolaris contrib/dev/acpica contrib/pf
	dev/usb dev/xen/xenpci
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Author: thompsa
Date: Thu Oct 29 23:13:02 2009
New Revision: 198637
URL: http://svn.freebsd.org/changeset/base/198637

Log:
  MFC r196496
  
   Add a reminder comment to optimize bus_dmamap_sync calls.

Modified:
  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/usb/usb_busdma.c
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/dev/usb/usb_busdma.c
==============================================================================
--- stable/8/sys/dev/usb/usb_busdma.c	Thu Oct 29 23:12:29 2009	(r198636)
+++ stable/8/sys/dev/usb/usb_busdma.c	Thu Oct 29 23:13:02 2009	(r198637)
@@ -679,6 +679,12 @@ usb_pc_cpu_invalidate(struct usb_page_ca
 		/* nothing has been loaded into this page cache! */
 		return;
 	}
+
+	/*
+	 * TODO: We currently do XXX_POSTREAD and XXX_PREREAD at the
+	 * same time, but in the future we should try to isolate the
+	 * different cases to optimise the code. --HPS
+	 */
 	bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_POSTREAD);
 	bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREREAD);
 }