linux-kernel - Re: [PATCH 2/3] mm, compaction: cover all compaction mode in compact

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Message-ID: <059f01d179b7$bc811fd0$35835f70$@alibaba-inc.com>
Date:	Wed, 09 Mar 2016 11:57:00 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Michal Hocko'" <mhocko@...nel.org>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>
Cc:	"'Hugh Dickins'" <hughd@...gle.com>,
	"'Sergey Senozhatsky'" <sergey.senozhatsky.work@...il.com>,
	"'Vlastimil Babka'" <vbabka@...e.cz>,
	"'Linus Torvalds'" <torvalds@...ux-foundation.org>,
	"'Johannes Weiner'" <hannes@...xchg.org>,
	"'Mel Gorman'" <mgorman@...e.de>,
	"'David Rientjes'" <rientjes@...gle.com>,
	"'Tetsuo Handa'" <penguin-kernel@...ove.SAKURA.ne.jp>,
	"'KAMEZAWA Hiroyuki'" <kamezawa.hiroyu@...fujitsu.com>,
	"'Joonsoo Kim'" <js1304@...il.com>, <linux-mm@...ck.org>,
	"'LKML'" <linux-kernel@...r.kernel.org>,
	"'Michal Hocko'" <mhocko@...e.com>
Subject: Re: [PATCH 2/3] mm, compaction: cover all compaction mode in compact_zone

> 
> From: Michal Hocko <mhocko@...e.com>
> 
> the compiler is complaining after "mm, compaction: change COMPACT_
> constants into enum"
> 
> mm/compaction.c: In function ‘compact_zone’:
> mm/compaction.c:1350:2: warning: enumeration value ‘COMPACT_DEFERRED’ not handled in switch [-Wswitch]
>   switch (ret) {
>   ^
> mm/compaction.c:1350:2: warning: enumeration value ‘COMPACT_COMPLETE’ not handled in switch [-Wswitch]
> mm/compaction.c:1350:2: warning: enumeration value ‘COMPACT_NO_SUITABLE_PAGE’ not handled in switch [-Wswitch]
> mm/compaction.c:1350:2: warning: enumeration value ‘COMPACT_NOT_SUITABLE_ZONE’ not handled in switch [-Wswitch]
> mm/compaction.c:1350:2: warning: enumeration value ‘COMPACT_CONTENDED’ not handled in switch [-Wswitch]
> 
> compaction_suitable is allowed to return only COMPACT_PARTIAL,
> COMPACT_SKIPPED and COMPACT_CONTINUE so other cases are simply
> impossible. Put a VM_BUG_ON to catch an impossible return value.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> ---

Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>