From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Hildenbrand <david@redhat.com>
Date: Mon, 05 Sep 2022 16:09:04 +0000
Subject: Re: [PATCH] hugetlb: simplify hugetlb handling in follow_page_mask
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To: Christophe Leroy <christophe.leroy@csgroup.eu>, Mike Kravetz <mike.kravetz@oracle.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>, Baolin Wang <baolin.wang@linux.alibaba.com>, "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>, Naoya Horiguchi <naoya.horiguchi@linux.dev>, Michael Ellerman <mpe@ellerman.id.au>, Muchun Song <songmuchun@bytedance.com>, Andrew Morton <akpm@linux-foundation.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>

> Yes I think the assumption is correct for user pages hence for GUP.
> 
> By the way the discussion started with PTDUMP. For PTDUMP we need huge
> page directories to be taken into account. And for anything that
> involves kernel pages like VMAP or VMALLOC.

Yes, makes perfect sense to me now that you explained how/where hugepd 
is actually used -- thanks!

-- 
Thanks,

David / dhildenb