On 09/24/2013 10:05 PM, Tejun Heo wrote:
> On Tue, Sep 24, 2013 at 09:53:47PM +0800, Zhang Yanfei wrote:
>> OK, this is just because we allocate pagtables just above the kernel.
>> And if we use up the BRK space that is reserved for inital pagetables,
>> we will use memblock to allocate memory for pagetables, and the memory
>> allocated here should be mapped already. So we first map [kernel_end, end)
>> to make memory above the kernel be mapped as soon as possible. And then
>> use pagetables allocated above the kernel to map [ISA_END_ADDRESS, kernel_end).
> 
> I see.  The code seems fine to me then.  Can you please add comment
> explaining why the split calls are necessary?

Okay, will add the comment.

Thanks.

-- 
Thanks.
Zhang Yanfei