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Date: Fri, 16 Sep 2016 04:23:41 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Miklos Szeredi <mszeredi@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH 07/11] pipe: remove generic_pipe_buf_confirm()
Message-ID: <20160916112341.GA3050@infradead.org>
References: <1473842236-28655-1-git-send-email-mszeredi@redhat.com>
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>  static inline int pipe_buf_confirm(struct pipe_inode_info *pipe,
>  				   struct pipe_buffer *buf)
>  {
> -	return buf->ops->confirm(pipe, buf);
> +	return 0;
>  }

Why do you keep pipe_buf_confirm around?