linux-kernel - Re: [PATCH V2] tipc: Use bsearch library function

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Date:   Sat, 16 Sep 2017 17:02:25 +0800
From:   Ying Xue <ying.xue@...driver.com>
To:     Thomas Meyer <thomas@...3r.de>, <jon.maloy@...csson.com>,
        <netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <davem@...emloft.net>
Subject: Re: [PATCH V2] tipc: Use bsearch library function

On 09/16/2017 03:50 PM, Thomas Meyer wrote:
> Use common library function rather than explicitly coding
> some variant of it yourself.
> 
> Signed-off-by: Thomas Meyer <thomas@...3r.de>

Acked-by: Ying Xue <ying.xue@...driver.com>

> ---
>  net/tipc/name_table.c | 30 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
> 
> V2: Coding style
> 
> diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
> index bd0aac87b41a..eeb4d7a13de2 100644
> --- a/net/tipc/name_table.c
> +++ b/net/tipc/name_table.c
> @@ -44,6 +44,7 @@
>  #include "addr.h"
>  #include "node.h"
>  #include <net/genetlink.h>
> +#include <linux/bsearch.h>
>  
>  #define TIPC_NAMETBL_SIZE 1024		/* must be a power of 2 */
>  
> @@ -168,6 +169,18 @@ static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_hea
>  	return nseq;
>  }
>  
> +static int nameseq_find_subseq_cmp(const void *key, const void *elt)
> +{
> +	struct sub_seq *sseq = (struct sub_seq *)elt;
> +	u32 instance = *(u32 *)key;
> +
> +	if (instance < sseq->lower)
> +		return -1;
> +	else if (instance > sseq->upper)
> +		return 1;
> +	return 0;
> +}
> +
>  /**
>   * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
>   *
> @@ -176,21 +189,8 @@ static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_hea
>  static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
>  					   u32 instance)
>  {
> -	struct sub_seq *sseqs = nseq->sseqs;
> -	int low = 0;
> -	int high = nseq->first_free - 1;
> -	int mid;
> -
> -	while (low <= high) {
> -		mid = (low + high) / 2;
> -		if (instance < sseqs[mid].lower)
> -			high = mid - 1;
> -		else if (instance > sseqs[mid].upper)
> -			low = mid + 1;
> -		else
> -			return &sseqs[mid];
> -	}
> -	return NULL;
> +	return bsearch(&instance, nseq->sseqs, nseq->first_free,
> +		       sizeof(struct sub_seq), nameseq_find_subseq_cmp);
>  }
>  
>  /**
>