linux-kernel - Re: Extending page pinning into fs/direct-io.c

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Date:   Thu, 25 May 2023 10:25:42 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Extending page pinning into fs/direct-io.c

On Thu, May 25, 2023 at 10:15 AM David Howells <dhowells@...hat.com> wrote:
>
>  It doesn't seem I can add it to mm.h as an inline function.

What? We already have that pattern inside is_longterm_pinnable_page(),
so that's really strange.

But regardless, please don't duplicate that odd conditional for no
reason, and don't scream.

So regardless of where it is, make that "is_zero_folio()" just do
"is_zero_page(&folio->page)" rather than repeat the question.

I also wonder whether we shouldn't just use the "transparent union"
argument thing more aggressively. Something like

   typedef union {
        struct page *page;
        struct folio *folio;
   } page_or_folio_t __attribute__ ((__transparent_union__));

and then you should be able to do something like this:

    static inline bool is_zero_page(const page_or_folio_t arg)
    {
        return is_zero_pfn(page_to_pfn(arg.page));
    }

and we don't have to keep generating the two versions over and over
and over again.

                Linus