linux-kernel - Re: [PATCH] mm: Simplify for_each_populated

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Message-ID: <5165CEB0.3010504@linux.vnet.ibm.com>
Date:	Thu, 11 Apr 2013 02:12:24 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: Simplify for_each_populated_zone()

On 04/11/2013 02:11 AM, David Rientjes wrote:
> On Thu, 11 Apr 2013, Srivatsa S. Bhat wrote:
> 
>> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
>> index ede2749..2489042 100644
>> --- a/include/linux/mmzone.h
>> +++ b/include/linux/mmzone.h
>> @@ -948,9 +948,7 @@ extern struct zone *next_zone(struct zone *zone);
>>  	for (zone = (first_online_pgdat())->node_zones; \
>>  	     zone;					\
>>  	     zone = next_zone(zone))			\
>> -		if (!populated_zone(zone))		\
>> -			; /* do nothing */		\
>> -		else
>> +		if (populated_zone(zone))
>>  
>>  static inline struct zone *zonelist_zone(struct zoneref *zoneref)
>>  {
> 
> Nack, it's written the way it is to avoid ambiguous else statements 
> following it.  People do things like
> 
> 	for_each_populated_zone(z)
> 		if (...) {
> 		} else (...) {
> 		}
> 
> and it's now ambiguous (and should warn with -Wparentheses).
> 

Hmm, fair enough. Please ignore this patch then. Thanks!

Regards,
Srivatsa S. Bhat

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