[Xen-devel] RE: Changeset 20209 causes an issue in xen_in_range()

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

I am curious that all bits of cpu_possible_map are all set to 1, so the related 
checks in percpu_free_unused_areas are unnecessary ?    
Xiantao


Keir Fraser wrote:
> On 14/01/2010 11:21, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
> 
>>>> However, in iommu_set_dom0_mapping(), xen_in_range() is still True
>>>> for the freed pages above, so devices in Dom0 can meet with DMA
>>>> fault. 
>>> 
>>> Should be fixed by c/s 20803.
>> 
>> Do you really think so? Masking "start" with PERCPU_SIZE-1 doesn't
>> make sense, as it may be arbitrarily before __percpu_start and
>> not aligned. Below my take on it.
> 
> How about c/s 20806?
> 
> 
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