linux-kernel - Re: [PATCH v6] hashtable: introduce a small and naive hashtable

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Date:	Wed, 26 Sep 2012 09:59:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	torvalds@...ux-foundation.org, tj@...nel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, mathieu.desnoyers@...icios.com,
	neilb@...e.de, bfields@...ldses.org, ejt@...hat.com,
	snitzer@...hat.com, edumazet@...gle.com, josh@...htriplett.org,
	rmallon@...il.com, palves@...hat.com
Subject: Re: [PATCH v6] hashtable: introduce a small and naive hashtable

On Wed, 2012-09-26 at 14:45 +0100, David Laight wrote:
> Amazing how something simple gets lots of comments and versions :-)
> 
> > ...
> > + * This has to be a macro since HASH_BITS() will not work on pointers since
> > + * it calculates the size during preprocessing.
> > + */
> > +#define hash_empty(hashtable)							\
> > +({										\
> > +	int __i;								\
> > +	bool __ret = true;							\
> > +										\
> > +	for (__i = 0; __i < HASH_SIZE(hashtable); __i++)			\
> > +		if (!hlist_empty(&hashtable[__i]))				\
> > +			__ret = false;						\
> > +										\
> > +	__ret;									\
> > +})
> 
> Actually you could have a #define that calls a function
> passing in the address and size.

Probably would be cleaner to do so.


> Also, should the loop have a 'break' in it?

Yeah it should, and could do:

	for (i = 0; i < HASH_SIZE(hashtable); i++)
		if (!hlist_empty(&hashtable[i]))
			break;

	return i < HASH_SIZE(hashtable);

-- Steve


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