From: Jeff Garzik <jgarzik@pobox.com>
To: "Michał Mirosław" <mirqus@gmail.com>
Cc: David Miller <davem@davemloft.net>,
bhutchings@solarflare.com, netdev@vger.kernel.org
Subject: Re: sfc: an enumeration is not a bitmask
Date: Tue, 17 May 2011 18:00:12 -0400 [thread overview]
Message-ID: <4DD2EFEC.9040504@pobox.com> (raw)
In-Reply-To: <BANLkTinaO0VVGpRRqRauH6FucvwbcXyRUg@mail.gmail.com>
On 05/17/2011 03:09 PM, Michał Mirosław wrote:
> 2011/5/17 Jeff Garzik<jgarzik@pobox.com>:
>> 2011/5/17 David Miller<davem@davemloft.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
next prev parent reply other threads:[~2011-05-17 22:00 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-17 18:14 sfc: an enumeration is not a bitmask David Miller
2011-05-17 18:18 ` Ben Hutchings
2011-05-17 18:23 ` David Miller
2011-05-17 18:48 ` [PATCH net-next-2.6] sfc: Suppress warning about combining enum flags by gcc 4.5 Ben Hutchings
2011-05-17 19:26 ` David Miller
2011-05-17 21:06 ` [PATCH net-next-2.6] sfc: Replace enum efx_fc_type with a 'bitwise' type Ben Hutchings
2011-05-17 21:14 ` David Miller
2011-05-17 21:22 ` Joe Perches
2011-05-17 21:28 ` David Miller
2011-05-17 21:30 ` Michał Mirosław
2011-05-17 21:36 ` Eric Dumazet
2011-05-17 21:43 ` Joe Perches
2011-05-17 21:43 ` [PATCH net-next-2.6] sfc: Replace enum efx_fc_type with macros and type alias Ben Hutchings
2011-05-17 21:45 ` David Miller
2011-05-18 2:01 ` [PATCH net-next-2.6] sfc: Replace enum efx_fc_type with a 'bitwise' type Jeff Garzik
2011-05-18 2:23 ` David Miller
2011-05-18 2:59 ` Jeff Garzik
2011-05-17 18:57 ` sfc: an enumeration is not a bitmask Jeff Garzik
2011-05-17 19:09 ` Michał Mirosław
2011-05-17 19:22 ` Ben Hutchings
2011-05-17 22:00 ` Jeff Garzik [this message]
2011-05-17 23:19 ` Michał Mirosław
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