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RE: [Xen-devel] [PATCH] linux: mor assign_irq_vector() adjustments
| To: | "Jan Beulich" <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] [PATCH] linux: mor assign_irq_vector() adjustments |
| From: | "Tian, Kevin" <kevin.tian@xxxxxxxxx> |
| Date: | Wed, 26 Apr 2006 11:09:16 +0800 |
| Delivery-date: | Tue, 25 Apr 2006 20:09:47 -0700 |
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| Thread-index: | AcZoZTCbwcjlWpeiQuyDSwYXrPqCKwAeMDLQ |
| Thread-topic: | [Xen-devel] [PATCH] linux: mor assign_irq_vector() adjustments |
>From: Jan Beulich >Sent: 2006年4月25日 20:39 > >Instead of adding locking to also protect irq_vector[] in xenlinux, this >patch adds verification that the vector passed >up from Xen for a certain IRQ is matching a potential previously obtained >value. Besides that, two minor cleanup hunks. > >Jan Is it useful to add that type of detect in xenlinux? Since lock has been added into xen, it's always the first one holding lock to trigger allocation process while the latter one getting cached vector returned directly. In this case, xen promises the consistence and it's always safe even two paths are writing irq_vector table simultaneously since two paths see same value... Thanks, Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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