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

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Date:	Sun, 14 Jun 2015 07:23:10 +0200 (CEST)
From:	Fabian Frederick <fabf@...net.be>
To:	Joe Perches <joe@...ches.com>
Cc:	Trond Myklebust <trond.myklebust@...marydata.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Anna Schumaker <anna.schumaker@...app.com>
Subject: Re: [PATCH 1/1 linux-next] pnfs/flexfiles: use swap() in
 ff_layout_sort_mirrors()



> On 12 June 2015 at 19:17 Joe Perches <joe@...ches.com> wrote:
>
>
> 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.

Of course but those swap() conversions already do some smooth cleanup.
btw it will be easier to find sort occurences and replace them if necessary.

Regards,
Fabian
>
> > 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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