linux-kernel - Re: [PATCH v3] staging: qlge: Fix indentation issue under long for loop

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Message-ID: <20220718021241.GA8270@cloud-MacBookPro>
Date:   Sun, 17 Jul 2022 19:12:41 -0700
From:   binyi <dantengknight@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Joe Perches <joe@...ches.com>, Manish Chopra <manishc@...vell.com>,
        GR-Linux-NIC-Dev@...vell.com, Coiby Xu <coiby.xu@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: qlge: Fix indentation issue under long for
 loop

On Fri, Jul 15, 2022 at 12:28:47PM +0300, Dan Carpenter wrote:
> On Thu, Jul 14, 2022 at 11:04:57PM -0700, binyi wrote:
> > On Tue, Jul 12, 2022 at 07:14:55AM -0700, Joe Perches wrote:
> > > On Tue, 2022-07-12 at 16:46 +0300, Dan Carpenter wrote:
> > > > > @@ -3007,10 +3007,12 @@ static int qlge_start_rx_ring(struct qlge_adapter *qdev, struct rx_ring *rx_ring
> > > > >  		tmp = (u64)rx_ring->lbq.base_dma;
> > > > >  		base_indirect_ptr = rx_ring->lbq.base_indirect;
> > > > >  
> > > > > -		for (page_entries = 0; page_entries <
> > > > > -			MAX_DB_PAGES_PER_BQ(QLGE_BQ_LEN); page_entries++)
> > > > > -				base_indirect_ptr[page_entries] =
> > > > > -					cpu_to_le64(tmp + (page_entries * DB_PAGE_SIZE));
> > > > > +		for (page_entries = 0;
> > > > > +		     page_entries < MAX_DB_PAGES_PER_BQ(QLGE_BQ_LEN);
> > > > > +		     page_entries++) {
> > > > > +			base_indirect_ptr[page_entries] = cpu_to_le64(tmp);
> > > > > +			tmp += DB_PAGE_SIZE;
> > > > 
> > > > I've previously said that using "int i;" is clearer here.  You would
> > > > kind of expect "page_entries" to be the number of entries, so it's kind
> > > > of misleading.  In other words, it's not just harmless wordiness and
> > > > needless exposition, it's actively bad.
> > > 
> > > Likely true.
> > > 
> > 
> > I agree it could be misleading. But if "page_entries" is in the for loop I
> > would assume it's some kind of index variable, and still it provides some
> > information (page entry) for the index, probably page_entry_idx could be
> > better name but still makes the for loop a very long one. I guess I would
> > leave it be.
> 
> It does not "provide some information".  That's what I was trying to
> explain.  It's the opposite of information.  Information is good. No
> information is neutral.  But anti-information is bad.

I see. Indeed, being neutral is better than being bad. 

> Like there are so many times in life where you listen to someone and you
> think you are learning something but you end up stupider than before.
> They have done studies on TV news where it can make you less informed
> than people who don't watch it.  And other studies say if you stop
> watching TV news for even a month then your brain starts to heal.
> 
> I don't really care about one line of code, but what I'm trying to say
> is learn to recognize anti-information and delete it.  Comments for
> example are often useless.

It makes more sense to me now. Thanks for explaining!

Best,
Binyi