netdev - Re: sfc: an enumeration is not a bitmask

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Date:	Tue, 17 May 2011 18:00:12 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Michał Mirosław <mirqus@...il.com>
CC:	David Miller <davem@...emloft.net>, bhutchings@...arflare.com,
	netdev@...r.kernel.org
Subject: Re: sfc: an enumeration is not a bitmask

On 05/17/2011 03:09 PM, Michał Mirosław wrote:
> 2011/5/17 Jeff Garzik<jgarzik@...ox.com>:
>> 2011/5/17 David Miller<davem@...emloft.net>:
>>> An enumeration is not a bitmask, instead it means one out of the set
>>> of enumerated values will be used.
>>
>> It's a decade-old kernel practice to use 'enum' to define typed
>> constants, preferred over  macros that convey no type information and
>> disappear after cpp phase.
>>
>> So your assertion about enumerations is demonstrably not true, as it
>> is often used in the kernel.  Call it enum abuse if you want, but it
>> is consistent with code all over the kernel.

> Old age of the mistake doesn't make it correct.

It is not a mistake, but a useful coding tool.

	Jeff


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