[PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem

[Li, ZhenHua]

Hi Baoquan,
I am using a list here to store all the mapped addresses, and unmap them 
out of iounmap.

About the reason, please check the old mails. I cannot remember the 
detailed reasons.

Thanks
Zhenhua

On 05/13/2015 05:00 PM, Baoquan He wrote:
> On 05/11/15 at 05:52pm, Li, Zhen-Hua wrote:
>> Add some functions to copy the data from old kernel.
>> These functions are used to copy context tables and page tables.
>>
>> To avoid calling iounmap between spin_lock_irqsave and spin_unlock_irqrestore,
>> use a link here, store the pointers , and then use iounmap to free them in
>> another place.
>
> Hi Zhenhua,
>
> I remember you mentioned iounmap will cause error inside
> spin_lock_irqsave. Do you know why it happened now? And could you also
> describe why avoid calling iounmap between
> spin_lock_irqsave/unlock_irqsave  is needed here and what's the status
> now?
>
> I think other reviewer may want to know it too.
>
> Thanks
> Baoquan
>