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

From: Tejun Heo
Date: Tue Sep 24 2013 - 09:27:38 EST

On Tue, Sep 24, 2013 at 09:23:48PM +0800, Zhang Yanfei wrote:
> > Hmm... so, this is kinda weird. We're doing it in two chunks and
> > mapping memory between ISA_END_ADDRESS and kernel_end right on top of
> > ISA_END_ADDRESS? Can't you give enough information to the mapping
> > function so that it can map everything on top of kernel_end in single
> > go?
> You mean we should call memory_map_bottom_up like this:
> memory_map_bottom_up(ISA_END_ADDRESS, end)
> right?

But that wouldn't be ideal as we want the page tables above kernel
image and the above would allocate it above ISA_END_ADDRESS, right?
Maybe memory_map_bottom_up() should take extra parameters for where to
allocate page tables at separately from the mapping range and treat it
specially? Would that make the function a lot more complex?


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