netdev - Re: [PATCH net-next] net: move inet_dport/inet_num in sock

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Date:	Wed, 28 Nov 2012 03:55:12 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Joe Perches <joe@...ches.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Ling Ma <ling.ma.program@...il.com>
Subject: Re: [PATCH net-next] net: move inet_dport/inet_num in sock_common

On Tue, 2012-11-27 at 19:31 -0800, Joe Perches wrote:
> On Wed, 2012-11-28 at 03:12 +0000, Ben Hutchings wrote:
> > On Tue, 2012-11-27 at 18:23 -0800, Joe Perches wrote:
> > > OK, so it's an and not an or.  Duh.
> > [...]
> > 
> > The way to combine these sorts of comparisons is along the lines of:
> > 
> > (((left->a ^ right->a) |
> >   (left->b ^ right->b) |
> >   ...) == 0)
> > 
> > But when there are big-endian types involved, sparse is likely to
> > complain about combining them.
> 
> I believe there's only the 2 items that could be combined
> for cacheline purposes so using 2 logical tests with AND
> seems more readable.  Maybe a single combined test would
> be faster.  I don't have equipment at hand to test it.
> 
> If you prefer I supposed it could be converted.

I don't particularly care, and I gave up this trick myself because it
didn't seem worth fighting sparse.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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