netdev - Re: [PATCH] net: kdoc struct net_device flags and priv

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Message-ID: <1393294265.6823.154.camel@deadeye.wl.decadent.org.uk>
Date:	Tue, 25 Feb 2014 02:11:05 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [PATCH] net: kdoc struct net_device flags and priv_flags

On Mon, 2014-02-24 at 16:14 -0800, Luis R. Rodriguez wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> We have documentation for these flags but they're scattered
> all over the place. #defines don't allow documentation to be
> written easily so to help to start bringing some documentation
> together use the enums kdoc practice but keep the defines to
> allow userspace to be able to #ifdef them.
> 
> I've verified the same values are assigned before and after
> with a simple userspace test program [0] and checksumming the
> output.
> 
> [0] http://drvbp1.linux-foundation.org/~mcgrof/kdoc/netdev_flags/
> 
> mcgrof@...t ~/tmp $ ./check-flags | sha1sum
> 0ec5b6b1840aa3bb9ce464e61c564820871c92c3  -
> 
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
> ---
>  include/uapi/linux/if.h | 201 +++++++++++++++++++++++++++++++++++-------------
>  1 file changed, 149 insertions(+), 52 deletions(-)
> 
> diff --git a/include/uapi/linux/if.h b/include/uapi/linux/if.h
> index d758163..1555623 100644
> --- a/include/uapi/linux/if.h
> +++ b/include/uapi/linux/if.h
[...]
> +/**
> + * enum net_device_priv_flags - &struct net_device priv_flags
> + *
> + * These are the &struct net_device, they are only set internally
> + * by drivers and used in the kernel but are invisible to userspace.
[...]

Indeed, I wonder why they are in the UAPI header.  As userland doesn't
have a legitimate use for them, maybe you could move them back to
include/linux/if.h instead of bothering with adding macros?

Ben.

-- 
Ben Hutchings
Everything should be made as simple as possible, but not simpler.
                                                           - Albert Einstein

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