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[Xen-devel] [PATCH]Fixes for overflowed calculation in vHPET
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH]Fixes for overflowed calculation in vHPET |
| From: | "Shan, Haitao" <haitao.shan@xxxxxxxxx> |
| Date: | Fri, 4 Jan 2008 11:21:18 +0800 |
| Cc: | Mark McLoughlin <markmc@xxxxxxxxxx>, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> |
| Delivery-date: | Thu, 03 Jan 2008 19:23:12 -0800 |
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| Thread-index: | AchIXkjedwVeiEy4RPSClG5JXO2lGgAACgGgAYh9u4A= |
| Thread-topic: | [PATCH]Fixes for overflowed calculation in vHPET |
|
This patch will fix the bugs in
hpet_set_timer. Currently in hpet_tick_to_ns,
the approach is multiplying first, which easily causes overflow when tick is
quite large. The patch cannot handle arbitrate large ticks duo to the precision
requirement and 64bit's value range. But by optimize the equation, a larger
ticks than current code can be supported. Also an overflow check is added before
the calculation.
This patch will also fix the wrong handling of wrap around case when timer is in 64bit mode. Best Regards
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