linux-kernel - Re: [PATCH] mm/lru: simplify is_file_lru() and is_active

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Message-ID: <20201117165319.GA83217@rlk>
Date:   Wed, 18 Nov 2020 00:53:19 +0800
From:   Hui Su <sh_def@....com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     sh_def@....com
Subject: Re: [PATCH] mm/lru: simplify is_file_lru() and is_active_lru()

On Wed, Nov 18, 2020 at 12:49:19AM +0800, Hui Su wrote:
> page->lru bit 0 can tell whether the page is
> avtive page or not.
> page->lru bit 1 can tell whether the page is
> file page or not.
> 
> Signed-off-by: Hui Su <sh_def@....com>
> ---
>  include/linux/mmzone.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index fb3bf696c05e..294369c652d0 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -258,12 +258,12 @@ enum lru_list {
>  
>  static inline bool is_file_lru(enum lru_list lru)
>  {
> -	return (lru == LRU_INACTIVE_FILE || lru == LRU_ACTIVE_FILE);
> +	return lru & LRU_FILE;
>  }
>  
>  static inline bool is_active_lru(enum lru_list lru)
>  {
> -	return (lru == LRU_ACTIVE_ANON || lru == LRU_ACTIVE_FILE);
> +	return lru & LRU_ACTIVE;
>  }
>  
>  #define ANON_AND_FILE 2
> -- 
> 2.29.0

The commit message is not correct, please ignore this change.