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xen-devel
[Xen-devel] RE: Bug in CS 20073
Keir Fraser wrote:
> On 21/08/2009 13:03, "Stephen Smalley" <sds@xxxxxxxxxxxxx> wrote:
>
>> On Thu, 2009-08-20 at 17:02 +0100, Keir Fraser wrote:
>>> Looks like a lock normally taken with irqs disabled may be being
>>> taken with irqs enabled. Which wouldn't be allowed but could be
>>> easy to fix.
>>
>> This appears to have been introduced by CS 20073, x86: Implement
>> per-cpu vector for xen hypervisor. It introduces mixed usage of
>> spin_lock() and spin_lock_irqsave() on the vector_lock, whereas
>> previously it was always spin_lock_irqsave().
>
> Xiantao, Can you make a patch for this? Any acquisition of the lock
> where irqs may not already be disabled must do spin_lock_irq or
> spin_lock_irqsave.
Yes, I will work out a fix for that. :)
Xiantao
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