From mboxrd@z Thu Jan  1 00:00:00 1970
From: rpravali069@gmail.com (ravali pullela)
Date: Mon, 8 Sep 2014 10:29:44 +0530
Subject: Query related to special pte mappings
Message-ID: <CA+gU_YJCgAj4pd-jZPV2d6CjKVDHc3hCeqDm5N6x7Z4O_1XO+A@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

These questions got raised while I was going through vm_normal_page -

1) Why are there some special pte_mappings? [when i went through
mm/memory.c, ]
2) why is [is_zero_pfn] zero pfn used?

I followed the code path, but could not understand semantically what is a
special pte mapping used for and this zer_pfn? It would be great if you can
please point me to resources.

Thanks !
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