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Date:   Thu, 6 May 2021 03:33:29 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     kernel test robot <lkp@intel.com>
Cc:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        kbuild-all@lists.01.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 46/96] mm: Add flush_dcache_folio
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 <202105060752.es5znqMC-lkp@intel.com>
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On Thu, May 06, 2021 at 07:35:16AM +0800, kernel test robot wrote:
>    In file included from arch/ia64/include/asm/cacheflush.h:31,
>                     from arch/ia64/include/asm/pgtable.h:153,
>                     from include/linux/pgtable.h:6,
>                     from arch/ia64/include/asm/uaccess.h:40,
>                     from include/linux/uaccess.h:11,
>                     from include/linux/sched/task.h:11,
>                     from include/linux/sched/signal.h:9,
>                     from arch/ia64/kernel/asm-offsets.c:10:
>    include/asm-generic/cacheflush.h: In function 'flush_dcache_folio':
> >> include/asm-generic/cacheflush.h:61:19: error: implicit declaration of function 'folio_nr_pages'; did you mean 'folio_page'? [-Werror=implicit-function-declaration]

Ugh, I can't be bothered to untangle the ia64 header file mess.
I'll just move the function out of line.