linux-kernel - Re: [PATCH] zsmalloc: drop unused member 'mapping

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Date:	Wed, 17 Feb 2016 14:20:58 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	YiPing Xu <xuyiping@...wei.com>
Cc:	minchan@...nel.org, ngupta@...are.org,
	sergey.senozhatsky.work@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, suzhuangluan@...ilicon.com,
	puck.chen@...ilicon.com, dan.zhao@...ilicon.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] zsmalloc: drop unused member 'mapping_area->huge'

On (02/17/16 09:56), YiPing Xu wrote:
> When unmapping a huge class page in zs_unmap_object, the page will
> be unmapped by kmap_atomic. the "!area->huge" branch in
> __zs_unmap_object is alway true, and no code set "area->huge" now,
> so we can drop it.
> 

the patch looks good to me, thanks.
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss

> Signed-off-by: YiPing Xu <xuyiping@...wei.com>
> ---
>  mm/zsmalloc.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 2d7c4c1..43e4cbc 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -281,7 +281,6 @@ struct mapping_area {
>  #endif
>  	char *vm_addr; /* address of kmap_atomic()'ed pages */
>  	enum zs_mapmode vm_mm; /* mapping mode */
> -	bool huge;
>  };
>  
>  static int create_handle_cache(struct zs_pool *pool)
> @@ -1127,11 +1126,9 @@ static void __zs_unmap_object(struct mapping_area *area,
>  		goto out;
>  
>  	buf = area->vm_buf;
> -	if (!area->huge) {
> -		buf = buf + ZS_HANDLE_SIZE;
> -		size -= ZS_HANDLE_SIZE;
> -		off += ZS_HANDLE_SIZE;
> -	}
> +	buf = buf + ZS_HANDLE_SIZE;
> +	size -= ZS_HANDLE_SIZE;
> +	off += ZS_HANDLE_SIZE;
>  
>  	sizes[0] = PAGE_SIZE - off;
>  	sizes[1] = size - sizes[0];
> -- 
> 1.8.3.2
>