linux-kernel - Re: [Drbd-dev] [PATCH net-next 0/8] netlink: align attributes when needed (patchset #3)

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Message-ID: <20160426121850.GC20950@soda.linbit>
Date:	Tue, 26 Apr 2016 14:18:50 +0200
From:	Lars Ellenberg <lars.ellenberg@...bit.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	netdev@...r.kernel.org, davem@...emloft.net, sd@...asysnail.net,
	johannes@...solutions.net, kvalo@...eaurora.org,
	linux-wireless@...r.kernel.org, jack@...e.com,
	linux-kernel@...r.kernel.org, pshelar@...ira.com,
	dev@...nvswitch.org, jhs@...atatu.com, philipp.reisner@...bit.com,
	drbd-dev@...ts.linbit.com
Subject: Re: [Drbd-dev] [PATCH net-next 0/8] netlink: align attributes when
 needed (patchset #3)

On Tue, Apr 26, 2016 at 01:54:27PM +0200, Lars Ellenberg wrote:
> On Tue, Apr 26, 2016 at 10:06:10AM +0200, Nicolas Dichtel wrote:
> > 
> > This is the continuation (series #3) of the work done to align netlink
> > attributes when these attributes contain some 64-bit fields.
> > 
> > It's the last patchset from what I've seen.
> > 
> > The last user of nla_put_u64() is block/drbd. This module does not use
> > standard netlink API (see all the stuff in include/linux/genl_magic_struct.h
> > and include/linux/genl_magic_func.h). I didn't modify it because it's seems
> > hard to do it whithout testing and fully understanding the context
> 
> Something like this should just work.

> + * @attrtype: attribute type
> + * @value: numeric value
> + */
> +static inline int nla_put_u64_64bit_unspec(struct sk_buff *skb, int attrtype,
> +				    u64 value)
> +{
> +	return nla_put_64bit(skb, attrtype, sizeof(u64), &value, NLA_UNSPEC);

Ok, I confused attribute and policy type there for a sec.
Anyways, 0 works just fine,
all our nested attribute enums are != 0,
because nla_parse skips type 0.

    Lars