netdev - Re: [PATCH net-next] ieee802154: fix variable declaration and initializer

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Date:	Tue, 18 Mar 2014 20:42:37 -0700
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jean Sacren <sakiwit@...il.com>,
	Alexander Smirnov <alex.bluesman.smirnov@...il.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	linux-zigbee-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	Phoebe Buckheister <phoebe.buckheister@...m.fraunhofer.de>
Subject: Re: [PATCH net-next] ieee802154: fix variable declaration and
 initializer

On Tue, 2014-03-18 at 20:32 -0700, Eric Dumazet wrote:
> On Tue, 2014-03-18 at 21:19 -0600, Jean Sacren wrote:
> 
> > 2) Fix the initializer by deleting the double logical negation
> >    operators as they don't serve any purpose.
> > 
> ...
> >  
> >  static int phy_set_lbt(struct wpan_phy *phy, struct genl_info *info)
> >  {
> > -	u8 on = !!nla_get_u8(info->attrs[IEEE802154_ATTR_LBT_ENABLED]);
> 
> You do realize !!(a) is not equivalent to (a) ?

It is when the type it's assigned to also changes
from u8 to bool.

I don't think it's a great style though.
I think the !! doesn't hurt here.

I'd've preferred it to be

	bool on = nla_get_u8(...)

rather than separating the declaration from the assignment
by a few lines of code.



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