Re: [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86

From: Dave Hansen
Date: Tue Feb 10 2015 - 13:59:12 EST

On 02/09/2015 02:45 PM, Toshi Kani wrote:
> Implement huge KVA mapping interfaces on x86. Select
> HAVE_ARCH_HUGE_VMAP when X86_64 or X86_32 with X86_PAE is set.
> Without X86_PAE set, the X86_32 kernel has the 2-level page
> tables and cannot provide the huge KVA mappings.

Not that it's a big deal, but what's the limitation with the 2-level
page tables on 32-bit? We have a 4MB large page size available there
and we already use it for the kernel linear mapping.
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