linux-kernel - Re: [PATCH 1/3] mm/gup: documentation corrections for gup/pup

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Message-ID: <YRCHZObkj/BJgCmR@casper.infradead.org>
Date:   Mon, 9 Aug 2021 02:39:48 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] mm/gup: documentation corrections for gup/pup

On Sun, Aug 08, 2021 at 04:50:16PM -0700, John Hubbard wrote:
> @@ -103,8 +103,14 @@ static inline struct page *try_get_compound_head(struct page *page, int refs)
>   * same time. (That's true throughout the get_user_pages*() and
>   * pin_user_pages*() APIs.) Cases:
>   *
> - *    FOLL_GET: page's refcount will be incremented by 1.
> - *    FOLL_PIN: page's refcount will be incremented by GUP_PIN_COUNTING_BIAS.
> + *    FOLL_GET: page's refcount will be incremented by refs.

I think this would read more clearly if it said @refs (throughout).

> + *
> + *    FOLL_PIN on compound pages that are > two pages long: page's refcount will
> + *        be incremented by refs, and page[2].hpage_pinned_refcount will be
> + *        incremented by refs * GUP_PIN_COUNTING_BIAS.
> + *
> + *    FOLL_PIN on normal pages, or compound pages that are two pages long:
> + *        page's refcount will be incremented by refs * GUP_PIN_COUNTING_BIAS.
>   *
>   * Return: head page (with refcount appropriately incremented) for success, or
>   * NULL upon failure. If neither FOLL_GET nor FOLL_PIN was set, that's

Did you run 'make htmldocs' and see how it renders?  I haven't looked,
but this might work better as an rst list?