* [PATCH] pit-div_round.patch
@ 2005-04-21 0:03 Arun Sharma
0 siblings, 0 replies; only message in thread
From: Arun Sharma @ 2005-04-21 0:03 UTC (permalink / raw)
To: Ian Pratt, Keir Fraser; +Cc: xen-devel
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@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>
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)
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2005-04-21 0:03 [PATCH] pit-div_round.patch Arun Sharma
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