linux-kernel - Re: [PATCH 00/23] [v4] KAISER: unmap most of the kernel from userspace page tables

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Date:   Thu, 23 Nov 2017 22:41:53 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, hughd@...gle.com, x86@...nel.org,
        jgross@...e.com
Subject: Re: [PATCH 00/23] [v4] KAISER: unmap most of the kernel from
 userspace page tables

On 11/23/2017 10:35 PM, Ingo Molnar wrote:
> So the pteval_t changes break the build on most non-x86 architectures (alpha, arm, 
> arm64, etc.), because most of them don't have an asm/pgtable_types.h file.
> 
> pteval_t is an x86-ism.
> 
> So I left out the changes below.

There was a warning on the non-PAE 32-bit builds saying that there was a
shift larger than the type.  I assumed this was because of a reference
to _PAGE_NX, and thus we needed a change to pteval_t.

But, now that I think about it more, that doesn't make sense since
_PAGE_NX should be #defined down to a 0 on those configs unless
something is wrong.