[Xen-devel][PATCH]Fix the issue of Dom0's multiple S3 failure. Improve accuracy of time offset calculation in S3.

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

Fix the issue: Dom0-S3 will fail after sleep-wake for several times.
  -Time zone info just needs to be calculated in S3 suspend procedure.
However, time_suspend() is also called on AP. That wasteful
get_cmos_time() on AP may break __cpu_die() assumption since
get_cmos_time() can take up to one second. This fix just limits it on
BSP.

Improve accuracy of the cmos_utc_offset calculation.
  -The get_cmos_time() function may take up to 1 second, while execution
of the NOW() macro could be very fast. So when calculating
cmos_utc_offset, get_cmos_time() should be firstly executed, and then 
(wc_sec + (wc_nsec + NOW()) / 1000000000ULL). 
This would make the calculation more accuracy than vice versa.

Signed-off-by: Xu Dongxiao <dongxiao.xu@xxxxxxxxx>

multi-s3.patch
Description: multi-s3.patch

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