linux-kernel - Re: [PATCH v6 02/27] x86, mm: make pgd next calculation consistent with pud/pmd

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Message-ID: <CAE9FiQVXr7X7PuJNGZbEZ=k3xWNw=_kJ07VdRtoKZyDYwV66AA@mail.gmail.com>
Date:	Wed, 19 Dec 2012 13:55:59 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 02/27] x86, mm: make pgd next calculation consistent
 with pud/pmd

On Wed, Dec 19, 2012 at 12:48 PM, Borislav Petkov <bp@...en8.de> wrote:
>
> "Also, do not boundary-check 'next' but pass 'end' down to
> phys_pud_init() instead because the loop in there terminates at
> PTRS_PER_PUD and thus can handle a possibly bigger 'end' properly."

---
Just like the way we calculate next for pud and pmd, aka
round down and add size.

Also, do not do boundary-checking with 'next', and just pass 'end'
down to phys_pud_init() instead. Because the loop in phys_pud_init()
terminates at PTRS_PER_PUD and thus can handle a possibly bigger
'end' properly.
---
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