linux-kernel - Re: [PATCH] mm: compaction: fix echo 1 > compact

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Date:	Mon, 7 Jan 2013 19:16:29 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Mel Gorman <mgorman@...e.de>, Jason Liu <r64343@...escale.com>,
	linux-kernel@...r.kernel.org, riel@...hat.com, minchan@...nel.org,
	kamezawa.hiroyu@...fujitsu.com, linux-mm@...ck.org
Subject: Re: [PATCH] mm: compaction: fix echo 1 > compact_memory return error
 issue

On Mon, 7 Jan 2013, Andrew Morton wrote:

> --- a/mm/compaction.c~mm-compaction-fix-echo-1-compact_memory-return-error-issue-fix
> +++ a/mm/compaction.c
> @@ -1150,7 +1150,7 @@ unsigned long try_to_compact_pages(struc
>  
>  
>  /* Compact all zones within a node */
> -static int __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
> +static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
>  {
>  	int zoneid;
>  	struct zone *zone;
> @@ -1183,11 +1183,9 @@ static int __compact_pgdat(pg_data_t *pg
>  		VM_BUG_ON(!list_empty(&cc->freepages));
>  		VM_BUG_ON(!list_empty(&cc->migratepages));
>  	}
> -
> -	return 0;
>  }
>  
> -int compact_pgdat(pg_data_t *pgdat, int order)
> +void compact_pgdat(pg_data_t *pgdat, int order)
>  {
>  	struct compact_control cc = {
>  		.order = order,
> @@ -1195,10 +1193,10 @@ int compact_pgdat(pg_data_t *pgdat, int 
>  		.page = NULL,
>  	};
>  
> -	return __compact_pgdat(pgdat, &cc);
> +	__compact_pgdat(pgdat, &cc);
>  }
>  
> -static int compact_node(int nid)
> +static void compact_node(int nid)
>  {
>  	struct compact_control cc = {
>  		.order = -1,
> @@ -1206,7 +1204,7 @@ static int compact_node(int nid)
>  		.page = NULL,
>  	};
>  
> -	return __compact_pgdat(NODE_DATA(nid), &cc);
> +	__compact_pgdat(NODE_DATA(nid), &cc);
>  }
>  
>  /* Compact all nodes in the system */
> diff -puN include/linux/compaction.h~mm-compaction-fix-echo-1-compact_memory-return-error-issue-fix include/linux/compaction.h
> --- a/include/linux/compaction.h~mm-compaction-fix-echo-1-compact_memory-return-error-issue-fix
> +++ a/include/linux/compaction.h
> @@ -23,7 +23,7 @@ extern int fragmentation_index(struct zo
>  extern unsigned long try_to_compact_pages(struct zonelist *zonelist,
>  			int order, gfp_t gfp_mask, nodemask_t *mask,
>  			bool sync, bool *contended, struct page **page);
> -extern int compact_pgdat(pg_data_t *pgdat, int order);
> +extern void compact_pgdat(pg_data_t *pgdat, int order);
>  extern void reset_isolation_suitable(pg_data_t *pgdat);
>  extern unsigned long compaction_suitable(struct zone *zone, int order);
>  
> @@ -80,9 +80,8 @@ static inline unsigned long try_to_compa
>  	return COMPACT_CONTINUE;
>  }
>  
> -static inline int compact_pgdat(pg_data_t *pgdat, int order)
> +static inline void compact_pgdat(pg_data_t *pgdat, int order)
>  {
> -	return COMPACT_CONTINUE;
>  }
>  
>  static inline void reset_isolation_suitable(pg_data_t *pgdat)

Acked-by: David Rientjes <rientjes@...gle.com>
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