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

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Date:	Wed, 26 Sep 2012 14:45:53 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Sasha Levin" <levinsasha928@...il.com>,
	<torvalds@...ux-foundation.org>
Cc:	<tj@...nel.org>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <rostedt@...dmis.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

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

	David



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