linux-kernel - Re: [PATCH] staging: fsl-dpaa2: Fix multiple assignments should be avoided

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Date:   Wed, 08 Nov 2017 03:39:42 -0800
From:   Joe Perches <joe@...ches.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andy Whitcroft <apw@...dowen.org>
Cc:     Joshua Abraham <j.abraham1776@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: fsl-dpaa2: Fix multiple assignments should be
 avoided

On Wed, 2017-11-08 at 12:40 +0300, Dan Carpenter wrote:
> On Wed, Nov 08, 2017 at 10:20:48AM +0100, Greg KH wrote:
> > On Tue, Nov 07, 2017 at 07:45:03PM -0500, Joshua Abraham wrote:
> > > This patch fixes the checkpatch.pl warning:
> > > "CHECK: multiple assignments should be avoided"
> > > 
> > > Signed-off-by: Joshua Abraham <j.abraham1776@...il.com>
> > > ---
> > >  drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
> > > index 0d8ed002adcb..384218946108 100644
> > > --- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
> > > +++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
> > > @@ -1661,7 +1661,8 @@ static void set_fq_affinity(struct dpaa2_eth_priv *priv)
> > >  	 * This may well change at runtime, either through irqbalance or
> > >  	 * through direct user intervention.
> > >  	 */
> > > -	rx_cpu = txc_cpu = cpumask_first(&priv->dpio_cpumask);
> > > +	rx_cpu = cpumask_first(&priv->dpio_cpumask);
> > > +	txc_cpu = rx_cpu;
> > 
> > The original code here makes much more sense, doesn't it?
> > 
> > Sometimes checkpatch is wrong :)
> 
> It feels like the majority of these multiple assignment warnings are
> wrong.  I thought it would be a good idea at first but after looking at
> a bunch of the patches it feels like we should just remove the check.

I don't have a particular opinion one way or another.

That bit was added to CodingStyle by Randy Dunlap back
in 2006 by

commit b3fc9941fbc6efe5cb77728adb0fb12be363e73e
Author: Randy Dunlap <randy.dunlap@...cle.com>
Date:   Sun Dec 10 02:18:56 2006 -0800

    [PATCH] CodingStyle updates
    
    Add some kernel coding style comments, mostly pulled from emails
    by Andrew Morton, Jesper Juhl, and Randy Dunlap.
    
    - add paragraph on switch/case indentation (with fixes)
    - add paragraph on multiple-assignments
    - add more on Braces
    - add section on Spaces; add typeof, alignof, & __attribute__ with sizeof;
      add more on postfix/prefix increment/decrement operators
    - add paragraph on function breaks in source files; add info on
      function prototype parameter names
    - add paragraph on EXPORT_SYMBOL placement
    - add section on /*-comment style, long-comment style, and data
      declarations and comments
    - correct some chapter number references that were missed when
      chapters were renumbered
    
    Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
    Acked-by: Jesper Juhl <jesper.juhl@...il.com>
    Acked-by: Jan Engelhardt <jengelh@....de>
    Signed-off-by: Andrew Morton <akpm@...l.org>