Re: [Xen-devel] [Help] Trigger Watchdog when adding an IPI in vcpu_wake

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Thu, 2016-09-22 at 11:12 +0200, Dario Faggioli wrote:
> _Almost_ correct. However, the problem is more that vcpu_wake() can
> happen in response to an IRQ, and when you grab a spinlock in IRQ
> context, you need to disable IRQs.
> 
> There is a good explanation of why, here:
> 
Ah, sorry, link is missing! Here:

https://www.kernel.org/doc/Documentation/locking/spinlocks.txt

Read the "Lesson 3: spinlocks revisited." section.

Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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