linux-kernel - hmm pud-entry callback locking?

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Date:   Sat, 5 Oct 2019 14:29:40 +0200
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>
Subject: hmm pud-entry callback locking?

Hi, Jerome,

I was asked by Kirill to try to unify the pagewalk pud_entry and 
pmd_entry callbacks. The only user of the pagewalk pud-entry is 
currently hmm.

But the pagewalk code call pud_entry only for huge puds with the 
page-table lock held, whereas the hmm callback appears to assume it gets 
called unconditionally without the page-table lock held?

Could you shed some light into this?

Thanks,
Thomas