linux-kernel - Re: [PATCH] fs:ocfs2:remove unneeded variable 'o2dlm

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Date:   Wed, 22 Apr 2020 15:52:05 +0800
From:   Joseph Qi <joseph.qi@...ux.alibaba.com>
To:     Wu Bo <wubo40@...wei.com>, mark@...heh.com, jlbec@...lplan.org
Cc:     linux-kernel@...r.kernel.org, ocfs2-devel@....oracle.com,
        liuzhiqiang26@...wei.com, linfeilong@...wei.com
Subject: Re: [PATCH] fs:ocfs2:remove unneeded variable 'o2dlm_flags'



On 2020/4/22 15:12, Wu Bo wrote:
> Fix the following coccicheck warning:
> fs/ocfs2/stack_o2cb.c:69:5-16: Unneeded variable: "o2dlm_flags". 
> Return "0" on line 84
> 
Umm... This is not right, NAK.
Something tricky is in map_flag() so that coccicheck doesn't recognize.

Thanks,
Joseph

> Signed-off-by: Wu Bo <wubo40@...wei.com>
> ---
>  fs/ocfs2/stack_o2cb.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/ocfs2/stack_o2cb.c b/fs/ocfs2/stack_o2cb.c
> index dbf8b57..2da9633 100644
> --- a/fs/ocfs2/stack_o2cb.c
> +++ b/fs/ocfs2/stack_o2cb.c
> @@ -66,8 +66,6 @@ static inline int mode_to_o2dlm(int mode)
>  	}
>  static int flags_to_o2dlm(u32 flags)
>  {
> -	int o2dlm_flags = 0;
> -
>  	map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE);
>  	map_flag(DLM_LKF_CANCEL, LKM_CANCEL);
>  	map_flag(DLM_LKF_CONVERT, LKM_CONVERT);
> @@ -81,7 +79,7 @@ static int flags_to_o2dlm(u32 flags)
>  	/* map_flag() should have cleared every flag passed in */
>  	BUG_ON(flags != 0);
>  
> -	return o2dlm_flags;
> +	return 0;
>  }
>  #undef map_flag
>  
>