linux-kernel - Re: [willy-pagecache:for-next 13/75] include/linux/mm.h:1570:29: error: conflicting types for 'page_to_section'; have 'long unsigned int(const struct page *)'

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Date:   Sat, 5 Feb 2022 01:08:29 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        William Kucharski <william.kucharski@...cle.com>,
        linux-mm@...ck.org
Subject: Re: [willy-pagecache:for-next 13/75] include/linux/mm.h:1570:29:
 error: conflicting types for 'page_to_section'; have 'long unsigned
 int(const struct page *)'

On Sat, Feb 05, 2022 at 06:54:20AM +0800, kernel test robot wrote:
> commit: 8788d4b404865697ebe822cff65a1380728ba251 [13/75] mm: Add folio_pincount_ptr()
>    include/linux/mm.h: In function 'folio_pincount_ptr':
>    include/asm-generic/memory_model.h:35:21: error: implicit declaration of function 'page_to_section'; did you mean 'present_section'? [-Werror=implicit-function-declaration]

Grr.  I can't use folio_page() until after page_to_section().  So I've
moved a lot of code around in patches 13 and 14.  New version pushed to
infradead.