linux-kernel - Re: [PATCH v2 10/10] mm/hugetlb: Document why page_vma_mapped

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Message-ID: <Y5KEukhLUgskntDE@x1n>
Date:   Thu, 8 Dec 2022 19:43:38 -0500
From:   Peter Xu <peterx@...hat.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Jann Horn <jannh@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        James Houghton <jthoughton@...gle.com>,
        Rik van Riel <riel@...riel.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <songmuchun@...edance.com>
Subject: Re: [PATCH v2 10/10] mm/hugetlb: Document why page_vma_mapped_walk()
 is safe to walk

On Thu, Dec 08, 2022 at 04:24:19PM -0800, John Hubbard wrote:
> It does! And now for the comment, I'll think you'll find that this suffices:
> 
> 		/*
> 		 * All callers that get here will already hold the i_mmap_rwsem.
> 		 * Therefore, no additional locks need to be taken before
> 		 * calling hugetlb_walk().
> 		 */
> 
> ...which, considering all the data above, is probably the mother of
> all summaries. :)  But really, it's all that people need to know here, and
> it's readily understandable without wondering what KSM has to do with this,
> for example.

I'm okay with the change. :)

I think what I'll do is I'll move part of the original one into commit
message, and take the new version in the code.

Thanks,

-- 
Peter Xu