netdev - Re: [PATCH net-next 4/7] mpls: Basic support for adding and removing routes

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Date:	Thu, 5 Mar 2015 14:10:03 -0500
From:	Bill Fink <billfink@...dspring.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	roopa <roopa@...ulusnetworks.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	santiago@...reenet.org, Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH net-next 4/7] mpls: Basic support for adding and
 removing routes

On Thu, 05 Mar 2015, Eric W. Biederman wrote:

> Bill Fink <billfink@...dspring.com> writes:
> 
> > On Wed, 04 Mar 2015, Eric W. Biederman wrote:
> >
> >> roopa <roopa@...ulusnetworks.com> writes:
> >> 
> >> > On 3/3/15, 5:12 PM, Eric W. Biederman wrote:
> >> >> +	/* Append makes no sense with mpls */
> >> >> +	err = -EINVAL;
> >> >
> >> > minor nit: should this be -ENOTSUPP in that case ? (NLM_F_REPLACE and NLM_F_APPEND are
> >> > really operations. But, one can argue that they are an attribute of the msg and hence -EINVAL might be ok).
> >> > I did not find any other such case for consistency check.
> >> 
> >> Yes.  IPv4 implements NLM_F_APPEND and IPv6 ignores it.
> >> 
> >> I will add a patch to change the error code.
> >
> > I believe the error -ENOTSUPP is deprecated and -EOPNOTSUPP should
> > be used instead.
> 
> Ack.
> 
> In particular ENOTSUPP is not allowed to make it to user space while
> EOPNOTSUPP is.
> 
> Which makes me a little leary when I grep the kernel code and I see so
> may uses of ENOTSUPP in the kernel when I grep for it.

Perhaps checkpatch.pl could be modified to warn about new uses
of ENOTSUPP.

						-Bill
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