linux-kernel - Re: [Patch v2 1/3] mm/swapfile.c: found_free could be represented by (tmp

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Date:   Wed, 22 Apr 2020 08:36:01 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Wei Yang <richard.weiyang@...il.com>
Cc:     <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <tim.c.chen@...ux.intel.com>
Subject: Re: [Patch v2 1/3] mm/swapfile.c: found_free could be represented by (tmp < max)

Wei Yang <richard.weiyang@...il.com> writes:

> This is not necessary to use the variable found_free to record the
> status. Just check tmp and max is enough.
>
> Signed-off-by: Wei Yang <richard.weiyang@...il.com>

All 3 patches looks good to me.  Thanks!

Reviewed-by: "Huang, Ying" <ying.huang@...el.com>

Best Regards,
Huang, Ying

> ---
>  mm/swapfile.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 469ab417ed43..d203cdc6750a 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -601,7 +601,6 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
>  {
>  	struct percpu_cluster *cluster;
>  	struct swap_cluster_info *ci;
> -	bool found_free;
>  	unsigned long tmp, max;
>  
>  new_cluster:
> @@ -623,8 +622,6 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
>  			return false;
>  	}
>  
> -	found_free = false;
> -
>  	/*
>  	 * Other CPUs can use our cluster if they can't find a free cluster,
>  	 * check if there is still free entry in the cluster
> @@ -638,21 +635,19 @@ static bool scan_swap_map_try_ssd_cluster(struct swap_info_struct *si,
>  	}
>  	ci = lock_cluster(si, tmp);
>  	while (tmp < max) {
> -		if (!si->swap_map[tmp]) {
> -			found_free = true;
> +		if (!si->swap_map[tmp])
>  			break;
> -		}
>  		tmp++;
>  	}
>  	unlock_cluster(ci);
> -	if (!found_free) {
> +	if (tmp >= max) {
>  		cluster_set_null(&cluster->index);
>  		goto new_cluster;
>  	}
>  	cluster->next = tmp + 1;
>  	*offset = tmp;
>  	*scan_base = tmp;
> -	return found_free;
> +	return tmp < max;
>  }
>  
>  static void __del_from_avail_list(struct swap_info_struct *p)