linux-kernel - Re: [PATCH trivial] include/linux/coda.h: remove useless '#else'

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Date:	Mon, 05 Aug 2013 09:53:34 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Joe Perches <joe@...ches.com>
CC:	Chen Gang F T <chen.gang.flying.transformer@...il.com>,
	'Jiri Kosina' <trivial@...nel.org>, jaharkes@...cmu.edu,
	coda@...cmu.edu, codalist@...a.cs.cmu.edu,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH trivial] include/linux/coda.h: remove useless '#else'

On 08/05/2013 09:21 AM, Joe Perches wrote:
> On Mon, 2013-08-05 at 08:24 +0800, Chen Gang wrote:
>> On 07/31/2013 11:16 AM, Chen Gang F T wrote:
>>> On 07/31/2013 09:53 AM, Chen Gang wrote:
>>>> On 07/31/2013 09:44 AM, Chen Gang wrote:
>>>>> On 07/30/2013 08:29 PM, Joe Perches wrote:
>>>>>> On Tue, 2013-07-30 at 15:30 +0800, Chen Gang wrote:
>>>>>>> '#else' is useless, need remove.
>>>>>>>
>>>>>>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>>>>>>> ---
>>>>>>>  include/linux/coda.h |    1 -
>>>>>>>  1 files changed, 0 insertions(+), 1 deletions(-)
>>>>>>>
>>>>>>> diff --git a/include/linux/coda.h b/include/linux/coda.h
>>>>>>> index cff544f..d30209b 100644
>>>>>>> --- a/include/linux/cod
>>>>>>> +++ b/include/linux/coda.h
>>>>>>> @@ -60,7 +60,6 @@ Mellon the rights to redistribute these changes without encumbrance.
>>>>>>>  
>>>>>>>  #if defined(__linux__)
>>>>>>>  typedef unsigned long long u_quad_t;
>>>>>>> -#else
>>>>>>>  #endif
>>>>>>>  #include <uapi/linux/coda.h>
>>>>>>>  #endif 
>>>>>>
>>>>>> Why have the #if at all?
>>>>>>
>>
>> Hmm... if any members have some questions about the fix, commonly it
>> means the related fix need additional improvement.
>>
>> Is it better to use BUILD_BUG() for the fix ?
> 
> Probably not.  __linux__ is predefined by gcc.
> 
> Using an #ifdef __linux__ might make some sense in
> in include/uapi, but not in include/linux.
> 
> 

Hmm... since "linux/coda.h" will include "uapi/linux/coda.h", it is
necessary to check __linux__ whether defined.

For some old compilers which is still widely used, they really do not
define __linux__, when use these compilers, we need give a necessary
check, if can not pass, need report BUILD_BUG().

e.g. for some versions of openrisc, please ref:
https://lkml.org/lkml/2013/7/30/888. (it is in applying work flow).


Thanks.
-- 
Chen Gang
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