Message-ID: <54DA54FA.7010707@intel.com>
Date: Tue, 10 Feb 2015 10:59:06 -0800
From: Dave Hansen <dave.hansen@intel.com>
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To: Toshi Kani <toshi.kani@hp.com>, akpm@linux-foundation.org, hpa@zytor.com,
        tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de
CC: linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org,
        Elliott@hp.com
Subject: Re: [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86
References: <1423521935-17454-1-git-send-email-toshi.kani@hp.com> <1423521935-17454-6-git-send-email-toshi.kani@hp.com>
In-Reply-To: <1423521935-17454-6-git-send-email-toshi.kani@hp.com>
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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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