linux-kernel - Re: [PATCH 1/6] PM / devfreq: Fix the checkpatch warnings

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Date:   Thu, 24 Nov 2016 02:52:38 -0800
From:   Joe Perches <joe@...ches.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com
Cc:     rjw@...ysocki.net, chanwoo@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] PM / devfreq: Fix the checkpatch warnings

On Thu, 2016-11-24 at 19:46 +0900, Chanwoo Choi wrote:
> On 2016년 11월 24일 19:20, Joe Perches wrote:
> > On Thu, 2016-11-24 at 14:01 +0900, Chanwoo Choi wrote:
> > > This patch just fixes the checkpatch warnings.
> > 
> > unrelated trivia:
> > 
> > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
[]
> > > @@ -576,11 +575,13 @@ struct devfreq *devfreq_add_device(struct device *dev,
> > >  		goto err_out;
> > >  	}
> > >  
> > > -	devfreq->trans_table =	devm_kzalloc(&devfreq->dev, sizeof(unsigned int) *
> > > +	devfreq->trans_table =	devm_kzalloc(&devfreq->dev,
> > > +						sizeof(unsigned int) *
> > >  						devfreq->profile->max_state *
> > >  						devfreq->profile->max_state,
> > >  						GFP_KERNEL);
> > > -	devfreq->time_in_state = devm_kzalloc(&devfreq->dev, sizeof(unsigned long) *
> > > +	devfreq->time_in_state = devm_kzalloc(&devfreq->dev,
> > > +						sizeof(unsigned long) *
> > >  						devfreq->profile->max_state,
> > >  						GFP_KERNEL);
> > 
> > Maybe these should be devm_kcalloc calls
> 
> Why should devfreq use the devm_kcalloc?

Because these are allocating zeroed arrays of a specific size.