linux-kernel - Re: [PATCH 5/6] x86: Fixup code testing if a pfn is direct mapped

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Date:	Wed, 29 Aug 2012 14:02:40 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jacob Shin <jacob.shin@....com>
Cc:	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>,
	Dave Young <dyoung@...hat.com>,
	Chao Wang <chaowang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 5/6] x86: Fixup code testing if a pfn is direct mapped

On Wed, Aug 29, 2012 at 12:04 PM, Jacob Shin <jacob.shin@....com> wrote:
> Update code that previously assumed pfns [ 0 - max_low_pfn_mapped ) and
> [ 4GB - max_pfn_mapped ) were always direct mapped, to now look up
> pfn_mapped ranges instead.

please swap patch 5 and patch 4 applying sequence.

aka.
should have
[PATCH 4/6] x86:Fixup code testing if a pfn is direct mapped
and it should have dummy function

bool pfn_range_is_mapped(u64 start_pfn, u64 end_pfn)
{
               return  end_pfn <= max_low_pfn_mapped
                   || (end_pfn > (1UL << (32 - PAGE_SHIFT))
                       && end_pfn <= max_pfn_mapped);
}

and

[PATCH 5/6] x86: Only direct map addresses that are marked as E820_RAM
will update pfn_range_is_mapped accordingly.

Thanks

Yinghai
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