linux-kernel - Re: [PATCH RFC 10/10] mm/hugetlb: Comment at rest huge_pte

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Message-Id: <3D896ED0-5600-4E55-8509-3F0E355FF692@gmail.com>
Date:   Mon, 31 Oct 2022 22:39:33 -0700
From:   Nadav Amit <nadav.amit@...il.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     Linux-MM <linux-mm@...ck.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        James Houghton <jthoughton@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <songmuchun@...edance.com>,
        Miaohe Lin <linmiaohe@...wei.com>
Subject: Re: [PATCH RFC 10/10] mm/hugetlb: Comment at rest huge_pte_offset()
 places

On Oct 30, 2022, at 2:30 PM, Peter Xu <peterx@...hat.com> wrote:

> +		/* With vma lock held, safe without RCU */
> 		src_pte = huge_pte_offset(src, addr, sz);

Just another option to consider: you can create an inline function
huge_pte_offset_locked_mm(), which would do the lockdep_assert_held_*().

I personally would prefer it, since it would clarify exactly the lock you
care about and "make the code document itself”.