Re: [PATCH v8 34/46] x86, mm: Add check before clear pte abovemax_low_pfn on 32bit

[Yinghai Lu]

On Wed, Nov 28, 2012 at 11:09 AM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
>>       /*
>>        * Remove any mappings which extend past the end of physical
>> -      * memory from the boot time page table:
>> +      * memory from the boot time page table.
>> +      * In virtual address space, we should have at least two pages
>> +      * from VMALLOC_END to pkmap or fixmap according to VMALLOC_END
>> +      * definition. And max_low_pfn is set to VMALLOC_END physical
>> +      * address. If initial memory mapping is doing right job, we
>> +      * should have pte used near max_low_pfn or one pmd is not present.
>
> 'have pte used near' ?
>
> Do you mean we should have an used PTE near max_low_pfn and one
> empty PMD?
>

==>
         * we should have used PTE to map address near max_low_pfn or
         * one empty PMD
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