linux-kernel - Re: [PATCH 1/1 linux-next] pnfs/flexfiles: use swap() in ff_layout_sort

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Date:	Fri, 12 Jun 2015 10:17:57 -0700
From:	Joe Perches <joe@...ches.com>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH 1/1 linux-next] pnfs/flexfiles: use swap() in
 ff_layout_sort_mirrors()

On Fri, 2015-06-12 at 18:58 +0200, Fabian Frederick wrote:
> Use kernel.h macro definition.

A lot of these conversions seem to be for bubble sorts.
Maybe it'd be useful to add a generic one somewhere.

> diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
[]
> @@ -182,17 +182,14 @@ static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
>  
>  static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
>  {
> -	struct nfs4_ff_layout_mirror *tmp;
>  	int i, j;
>  
>  	for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
>  		for (j = i + 1; j < fls->mirror_array_cnt; j++)
>  			if (fls->mirror_array[i]->efficiency <
> -			    fls->mirror_array[j]->efficiency) {
> -				tmp = fls->mirror_array[i];
> -				fls->mirror_array[i] = fls->mirror_array[j];
> -				fls->mirror_array[j] = tmp;
> -			}
> +			    fls->mirror_array[j]->efficiency)
> +				swap(fls->mirror_array[i],
> +				     fls->mirror_array[j]);
>  	}
>  }
>  



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