linux-kernel - Re: [PATCH RFC 05/13] mm/rmap: remove do_page_add_anon

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Message-ID: <CAHk-=whkO8w6YFbn8YsvwxgDi_pyUeKTCEgncDAzV6_kcqRJMw@mail.gmail.com>
Date:   Thu, 24 Feb 2022 09:48:04 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Yang Shi <shy828301@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Michal Hocko <mhocko@...nel.org>,
        Nadav Amit <namit@...are.com>, Rik van Riel <riel@...riel.com>,
        Roman Gushchin <guro@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Donald Dutile <ddutile@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Oleg Nesterov <oleg@...hat.com>, Jan Kara <jack@...e.cz>,
        Liang Zhang <zhangliang5@...wei.com>,
        Pedro Gomes <pedrodemargomes@...il.com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH RFC 05/13] mm/rmap: remove do_page_add_anon_rmap()

On Thu, Feb 24, 2022 at 9:41 AM David Hildenbrand <david@...hat.com> wrote:
>
> Actually, I thought about doing it similarly to what I did in
> page_alloc.c with fpi_t:
>
> typedef int __bitwise fpi_t;
>
> #define FPI_NONE                ((__force fpi_t)0)
>
> I can do something similar here.

Yeah, that looks good. And then the relevant function declarations and
definitions also have that explicit type there instead of 'int', which
adds a bit more documentation for people grepping for use.

Thanks,
               Linus