linux-kernel - Re: [PATCH -next] batadv: Slight optimization of batadv_compare

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Date:	Fri, 06 Dec 2013 13:17:01 -0800
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	mareklindner@...mailbox.ch, sw@...onwunderlich.de,
	antonio@...hcoding.com, b.a.t.m.a.n@...ts.open-mesh.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] batadv: Slight optimization of batadv_compare_eth

On Fri, 2013-12-06 at 15:39 -0500, David Miller wrote:
> From: Joe Perches <joe@...ches.com>
> Date: Fri, 06 Dec 2013 00:18:10 -0800
> 
> > @@ -266,7 +266,11 @@ static inline void batadv_dbg(int type __always_unused,
> >   */
> >  static inline int batadv_compare_eth(const void *data1, const void *data2)
> >  {
> > -	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
> > +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
> > +	return ether_addr_equal(data1, data2);
> > +#else
> > +	return memcmp(data1, data2, ETH_ALEN) == 0;
> > +#endif
> >  }
> 
> Let's not crap up implementations with these ifdefs.
> 
> What's the specific situation here?  Is it that 'data1' and/or
> 'data2' my not be u16 aligned?

Yes.

> If so, make a function for that in linux/etherdevice.h and invoke it
> in such places.  You can name it something like
> "ether_addr_equal_unaligned()" or similar.

I'll resubmit if/after you apply the
ether_addr_equal/compare_ether_addr removal.

cheers, Joe


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