xen-devel

[Top] [All Lists]

[Xen-devel] [PATCH] pit-div_round.patch

from [Arun Sharma]

[Permanent Link][Original]

To:	Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject:	[Xen-devel] [PATCH] pit-div_round.patch
From:	Arun Sharma <arun.sharma@xxxxxxxxx>
Date:	Wed, 20 Apr 2005 17:03:54 -0700
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Wed, 20 Apr 2005 23:59:11 +0000
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent:	Mutt/1.4.1i

Truly round off the div result to get right PIT frequency for guest. 
Otherwise, the guest's idea of time drifts away from that of the host.
 
Signed-off-by: Edwin Zhai <edwin.zhai@xxxxxxxxx>
Signed-off-by: Arun Sharma <arun.sharma@xxxxxxxxx>

Index: trunk/xen/include/xen/lib.h
===================================================================
--- trunk/xen/include/xen/lib.h (revision 688)
+++ trunk/xen/include/xen/lib.h (working copy)
@@ -21,7 +21,7 @@
 #define SWAP(_a, _b) \
    do { typeof(_a) _t = (_a); (_a) = (_b); (_b) = _t; } while ( 0 )
 
-#define DIV_ROUND(x, y) (((x) + (y) - 1) / (y))
+#define DIV_ROUND(x, y) (((x) + (y) / 2) / (y))
 
 #define reserve_bootmem(_p,_l) ((void)0)
 

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

[More with this subject...]

<Prev in Thread]	Current Thread	[Next in Thread>
[Xen-devel] [PATCH] pit-div_round.patch, Arun Sharma <=

Previous by Date:	[Xen-devel] [PATCH] fix-multiple-vmxon.patch, Arun Sharma
Next by Date:	[Xen-devel] [PATCH] use-large-file-api.patch, Arun Sharma
Previous by Thread:	[Xen-devel] [PATCH] fix-multiple-vmxon.patch, Arun Sharma
Next by Thread:	[Xen-devel] [PATCH] use-large-file-api.patch, Arun Sharma
Indexes:	[Date] [Thread] [Top] [All Lists]