lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20120926143126.GA22699@Krystal>
Date:	Wed, 26 Sep 2012 10:31:27 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
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,
	rostedt@...dmis.org, ebiederm@...ssion.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

* David Laight (David.Laight@...LAB.COM) 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.
> Also, should the loop have a 'break' in it?

+1   Removing unnecessary variables defined within a
statement-expression is indeed something we want, and your suggestion of
a macro calling a static inline is, IMHO, spot-on.

The same should be done for hash_init().

And yes, a break would be welcome in that loop: no need to continue if
we encounter a non-empty hlist.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ