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Message-ID: <BANLkTi=C24pTxhMRtaT40Rrj9Z1s+DH=jg@mail.gmail.com> Date: Wed, 18 May 2011 01:19:01 +0200 From: Michał Mirosław <mirqus@...il.com> To: Jeff Garzik <jgarzik@...ox.com> Cc: David Miller <davem@...emloft.net>, bhutchings@...arflare.com, netdev@...r.kernel.org Subject: Re: sfc: an enumeration is not a bitmask W dniu 18 maja 2011 00:00 użytkownik Jeff Garzik <jgarzik@...ox.com> napisał: > 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. Being it a mistake does not contradict usefulness. ;-) C has bitfields for the uses where masks and shifts are usually used. Unfortunately, those usually require more typing and sometimes compile to worse code. Best Regards, Michał Mirosław -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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