linux-kernel - Re: [PATCH v8 12/46] x86, mm: use pfn_range_is

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Message-ID: <CAE9FiQVCf1u86VyuWhD+u2YyGfY6W1V7QjNXKyAU3Vuqi3mR6A@mail.gmail.com>
Date:	Wed, 28 Nov 2012 11:33:24 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 12/46] x86, mm: use pfn_range_is_mapped() with CPA

On Wed, Nov 28, 2012 at 9:06 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> On Fri, Nov 16, 2012 at 07:38:49PM -0800, Yinghai Lu wrote:
>> We are going to map ram only, so under max_low_pfn_mapped,
>> between 4g and max_pfn_mapped does not mean mapped at all.
>
> I think I know what you are saying but I am having a hard
> time parsing it. Is this what you mean?
>
> "We check to see if the PFNs are under max_low_pfn_mapped or
> between 4G and max_pfn_mapped. If they are not: then we
> map them."  ?

No

---
We are going to map ram only in patch:
        x86, mm: Only direct map addresses that are marked as E820_RAM

so range under max_low_pfn_mapped, ranges between 4g and max_pfn_mapped
could have holes in them and the holes will not be mapped.

Use pfn_range_is_mapped() to check if the range is mapped.
---
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