linux-kernel - Re: [PATCH] staging: axis-fifo: Fix line over 80 characters error

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Date:   Thu, 25 Oct 2018 16:44:02 +0200
From:   Aleksa Zdravkovic <alex.zdravkovic98@...il.com>
To:     Joe Perches <joe@...ches.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: axis-fifo: Fix line over 80 characters error

On Wed, Oct 24, 2018 at 11:18:17PM -0700, Joe Perches wrote:
> On Thu, 2018-10-25 at 09:05 +0300, Dan Carpenter wrote:
> > On Wed, Oct 24, 2018 at 05:05:53PM +0200, Aleksa Zdravkovic wrote:
> > > This patch fixes the checkpatch.pl warning:
> []
> > > diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c
> []
> > > @@ -482,10 +482,10 @@ static ssize_t axis_fifo_write(struct file *f, const char __user *buf,
> > >  		spin_lock_irq(&fifo->write_queue_lock);
> > >  		ret = wait_event_interruptible_lock_irq_timeout
> > >  			(fifo->write_queue,
> > > -			 ioread32(fifo->base_addr + XLLF_TDFV_OFFSET)
> > > +			ioread32(fifo->base_addr + XLLF_TDFV_OFFSET)
> > >  				>= words_to_write,
> > > -			 fifo->write_queue_lock,
> > > -			 (write_timeout >= 0) ? msecs_to_jiffies(write_timeout) :
> > > +			fifo->write_queue_lock,
> > > +			(write_timeout >= 0) ? msecs_to_jiffies(write_timeout) :
> > >  				MAX_SCHEDULE_TIMEOUT);
> > 
> > The original was fine.  Just leave it.
> > 
> > Checkpatch.pl is only useful if it improves the readability for humans.
> 
> True, but I think the original is just OK.
> 
> Any suggestion on how to make the thing better?
> 
> wait_event_interruptible_lock_irq_timeout is a fairly long
> identifier with multiple long arguments.
> 
> It's as if it should be written here as
> 
>  		ret = wait_event_interruptible_lock_irq_timeout(fifo->write_queue,
> 								ioread32(fifo->base_addr + XLLF_TDFV_OFFSET) >= words_to_write,
> 								fifo->write_queue_lock,
> 								write_timeout >= 0 ? msecs_to_jiffies(write_timeout) : MAX_SCHEDULE_TIMEOUT);
> 
> where the longest is way over 80 chars, (140?) but I simply don't care
> because it's just that much more readable for me.
> 
> 

Thank you Dan and Joe for your feedback.

I don't have any suggestion how to improve this code otherwise.
I will try to find a way to improve it. Maybe we can define some
macros but I don't think it would help much.