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Date: Thu, 25 Jun 2015 13:13:37 +0530
From: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Jeremy Kerr <jeremy.kerr@au1.ibm.com>
Subject: Re: [PATCH] powerpc/powernv: Fix vma page prot flags in opal-prd
 driver
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References: <20150621182616.9866.16633.stgit@drishya>
 <20150625061546.GA4233@dirshya.in.ibm.com>
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* Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> [2015-06-25 11:45:46]:

[snip]
 
> Hi Ben,
> 
> remap_pfn_range() is the correct method to map the firmware pages
> because we will not have struct page associated with this RAM area.
> 
> We do a memblock_reserve() in early boot and take out this memory from
> kernel and avoid struct page allocation/init for these.

Kindly ignore the this comment.  memblock_reserve() does not
prevent/avoid struct page allocation.  We do have valid struct page
which can be used for mapping.

--Vaidy