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

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Message-ID: <1305656319.2848.28.camel@bwh-desktop>
Date:	Tue, 17 May 2011 19:18:39 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: sfc: an enumeration is not a bitmask

On Tue, 2011-05-17 at 14:14 -0400, David Miller wrote:
> Ben can you please get rid of "enum efx_fc_type"?
> 
> drivers/net/sfc/mcdi_mac.c: In function ‘efx_mcdi_set_mac’:
> drivers/net/sfc/mcdi_mac.c:36:2: warning: case value ‘3’ not in enumerated type ‘enum efx_fc_type’
> 
> An enumeration is not a bitmask, instead it means one out of the set
> of enumerated values will be used.  This means that the warning
> here about:
> 
> 	switch (efx->wanted_fc) {
> 	case EFX_FC_RX | EFX_FC_TX:
> 
> is completely legitimate.

I think this is common practice in C.  I filed a bug regarding the
warning at <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46457>, which
has not yet been resolved either way.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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