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Message-ID: <7f60bcac-a2e5-9c4b-8a8f-e972a93e116@google.com>
Date: Wed, 9 Nov 2022 18:10:12 -0800 (PST)
From: Hugh Dickins <hughd@...gle.com>
To: Sidhartha Kumar <sidhartha.kumar@...cle.com>
cc: Hugh Dickins <hughd@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Kirill A. Shutemov" <kirill@...temov.name>,
Matthew Wilcox <willy@...radead.org>,
David Hildenbrand <david@...hat.com>,
Vlastimil Babka <vbabka@...e.cz>, Peter Xu <peterx@...hat.com>,
Yang Shi <shy828301@...il.com>,
John Hubbard <jhubbard@...dia.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Muchun Song <songmuchun@...edance.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
Mina Almasry <almasrymina@...gle.com>,
James Houghton <jthoughton@...gle.com>,
Zach O'Keefe <zokeefe@...gle.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] mm,hugetlb: use folio fields in second tail page
On Wed, 9 Nov 2022, Sidhartha Kumar wrote:
> On 11/3/22 9:29 PM, Hugh Dickins wrote:
> >
> >> Should the usage of page_1 and page_2 also be documented here?
> > You must have something interesting in mind to document about them,
> > but I cannot guess what! They are for field alignment, not for use.
> > (page_2 to help when/if someone needs to add another pageful.)
> >
> > Do you mean that I should copy the
> > /* private: the union with struct page is transitional */
> > comment from above the original "struct page page;" line I copied?
> > Or give all three of them a few underscores to imply not for use?
>
> I think the underscores with a comment about not for use could be helpful.
I've given them two underscores (but not to the original "struct page page",
since a build showed that used as "page" elsewhere, not just for alignment).
I'm sorry, but I've not given them any comment: I don't think they
belong in the commented fields section (_flags_1 etc), "page" is not
there; and I'm, let's be honest, terrified of dabbling in this kerneldoc
area - feel very fortunate to have escaped attack by a robot for my
additions so far. I'll leave adding comment to you or other cognoscenti.
Hugh
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