linux-kernel - Re: [PATCH] x86/mm: fix regression with huge pages on PAE

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Message-ID: <CAA9_cmei11nOh8oO_kFyqupf=MSpMHN-OZxVCRajZs1zenu7QA@mail.gmail.com>
Date:	Fri, 13 Nov 2015 01:01:28 -0800
From:	Dan Williams <dan.j.williams@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Borislav Petkov <bp@...en8.de>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Anvin <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Jürgen Groß <jgross@...e.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	elliott@....com, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Toshi Kani <toshi.kani@....com>
Subject: Re: [PATCH] x86/mm: fix regression with huge pages on PAE

On Thu, Nov 12, 2015 at 11:29 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Nov 12, 2015 at 12:00 AM, Ingo Molnar <mingo@...nel.org> wrote:
[..]
> I have this dim memory of us playing around with just making PAGE_SIZE
> (and thus PAGE_MASK) always be signed, but that it caused other
> problems. Signed types have downsides too.

FWIW, I ran into this recently with the pfn_t patch.  mips and powerpc
have PAGE_MASK as a signed int.
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