Messages in this thread | | | Date | Tue, 24 Sep 2013 10:05:45 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH 4/6] x86/mem-hotplug: Support initialize page tables bottom up |
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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?
Thanks.
-- tejun
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