linux-kernel - Re: [PATCH] iio: Use parens with sizeof

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Date:   Sun, 17 Jul 2022 16:08:27 -0400
From:   Joe Simmons-Talbott <joetalbott@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: Use parens with sizeof

On Sun, Jul 17, 2022 at 10:08:37AM -0700, Joe Perches wrote:
> On Sun, 2022-07-17 at 11:34 -0400, Joe Simmons-Talbott wrote:
> > Prefer 'sizeof(var)' over 'sizeof var' as reported by checkpatch.pl.
> 
> unrelated trivia:
> 
> > diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
> []
> > @@ -368,7 +368,7 @@ struct iio_poll_func
> >  	va_list vargs;
> >  	struct iio_poll_func *pf;
> >  
> > -	pf = kmalloc(sizeof *pf, GFP_KERNEL);
> > +	pf = kmalloc(sizeof(*pf), GFP_KERNEL);
> >  	if (pf == NULL)
> >  		return NULL;
> >  	va_start(vargs, fmt);
> > @@ -560,7 +560,7 @@ struct iio_trigger *viio_trigger_alloc(struct device *parent,
> >  	struct iio_trigger *trig;
> >  	int i;
> >  
> > -	trig = kzalloc(sizeof *trig, GFP_KERNEL);
> > +	trig = kzalloc(sizeof(*trig), GFP_KERNEL);
> >  	if (!trig)
> >  		return NULL;
> 
> It'd be nice to be consistent with the allocation return test.
> 
> Please pick one of:
> 
> 	if (ptr == NULL)
> or
> 	if (!ptr)		// my preference
> 

I'm happy to submit a patch for that.  Do you want me to include a
Suggested-by: tag?

Thanks,
Joe