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

[Wei Yang <richard.weiyang@xxxxxxxxxx>]

On Thu, Sep 22, 2016 at 11:55:16AM +0200, Dario Faggioli wrote:
>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.
>

Oh, you have a link here ... let me digest it.

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


-- 
Richard Yang\nHelp you, Help me

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