linux-kernel - Re: [PATCH 2/6 v6] vfs: export do_splice

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Date:	Tue, 1 Mar 2011 16:49:07 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	apw@...onical.com
Subject: Re: [PATCH 2/6 v6] vfs: export do_splice_direct() to modules

Miklos,

On Tue, Mar 1, 2011 at 1:36 PM, Miklos Szeredi <miklos@...redi.hu> wrote:
> From: Miklos Szeredi <mszeredi@...e.cz>
>
> Export do_splice_direct() to modules.  Needed by overlay filesystem.
>
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
> ---
>  fs/splice.c |    1 +
>  1 file changed, 1 insertion(+)
>
> Index: linux-2.6/fs/splice.c
> ===================================================================
> --- linux-2.6.orig/fs/splice.c  2011-02-22 11:04:39.000000000 +0100
> +++ linux-2.6/fs/splice.c       2011-03-01 12:18:16.000000000 +0100
> @@ -1296,6 +1296,7 @@ long do_splice_direct(struct file *in, l
>
>        return ret;
>  }
> +EXPORT_SYMBOL(do_splice_direct);

I have a question on your patch, why are you using EXPORT_SYMBOL()
instead of EXPORT_SYMBOL_GPL()?
Are you using EXPORT_SYMBOL() because all symbols in fs/splice.c
are exported via EXPORT_SYMBOL()?

To be more precise, are there any rules to decide when _GPL() should be used?
IMHO we should always use _GPL() for new symbols.

>  static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
>                               struct pipe_inode_info *opipe,
>
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-- 
Thanks,
//richard
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