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Date:   Tue, 9 Feb 2021 07:47:23 +0000
From:   Christoph Hellwig <hch@infradead.org>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        hch@infradead.org, akpm@linux-foundation.org
Subject: Re: [PATCH 1/3] mm: provide filemap_range_needs_writeback() helper
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> +extern bool filemap_range_needs_writeback(struct address_space *,
> +					  loff_t lstart, loff_t lend);

no need for the extern.