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

[Baoquan He]

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

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