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Date:   Tue, 14 Jan 2020 16:22:13 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Alex Shi <alex.shi@linux.alibaba.com>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/vmscan: remove unused RECLAIM_OFF/RECLAIM_ZONE
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On Tue, 14 Jan 2020 20:39:33 +0800 Alex Shi <alex.shi@linux.alibaba.com> wrote:

> commit 1b2ffb7896ad ("[PATCH] Zone reclaim: Allow modification of zone reclaim behavior")'
> defined RECLAIM_OFF/RECLAIM_ZONE, but never use them, so better to remove them.
> 
> ...
>
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -4126,8 +4126,6 @@ static int __init kswapd_init(void)
>   */
>  int node_reclaim_mode __read_mostly;
>  
> -#define RECLAIM_OFF 0
> -#define RECLAIM_ZONE (1<<0)	/* Run shrink_inactive_list on the zone */
>  #define RECLAIM_WRITE (1<<1)	/* Writeout pages during reclaim */
>  #define RECLAIM_UNMAP (1<<2)	/* Unmap pages during reclaim */

--- a/mm/vmscan.c~mm-vmscan-remove-unused-reclaim_off-reclaim_zone-fix
+++ a/mm/vmscan.c
@@ -4118,8 +4118,8 @@ module_init(kswapd_init)
  */
 int node_reclaim_mode __read_mostly;
 
-#define RECLAIM_WRITE (1<<1)	/* Writeout pages during reclaim */
-#define RECLAIM_UNMAP (1<<2)	/* Unmap pages during reclaim */
+#define RECLAIM_WRITE (1<<0)	/* Writeout pages during reclaim */
+#define RECLAIM_UNMAP (1<<1)	/* Unmap pages during reclaim */
 
 /*
  * Priority for NODE_RECLAIM. This determines the fraction of pages
_

This might be a bit picky ;)