Re: [PATCH 4/6] x86/mem-hotplug: Support initialize page tablesbottom up

From: Tejun Heo
Date: Tue Sep 24 2013 - 10:05:55 EST

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?


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