linux-kernel - Re: [PATCH v9 92/96] iomap: Convert iomap_write_begin and iomap_write

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Date:   Wed, 5 May 2021 23:10:56 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     kernel test robot <lkp@...el.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 92/96] iomap: Convert iomap_write_begin and
 iomap_write_end to folios

On Thu, May 06, 2021 at 05:36:54AM +0800, kernel test robot wrote:
> config: nds32-defconfig (attached as .config)
>    fs/iomap/buffered-io.c: In function '__iomap_write_end':
> >> fs/iomap/buffered-io.c:645:2: error: implicit declaration of function 'flush_dcache_folio'; did you mean 'flush_dcache_page'? [-Werror=implicit-function-declaration]
>      645 |  flush_dcache_folio(folio);
>          |  ^~~~~~~~~~~~~~~~~~
>          |  flush_dcache_page
>    cc1: some warnings being treated as errors

Argh, nds32 doesn't (always) include asm-generic/cacheflush.h, so it
doesn't pick up the generic implementation of flush_dcache_folio().
Copy-and-pasted it to nds32.

Thanks.