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Date:   Sat, 2 May 2020 00:36:48 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Joe Perches <joe@...ches.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        Andy Whitcroft <apw@...onical.com>
Subject: RE: [PATCH] checkpatch: add NL_SET_ERR_MSG to 80 column exceptions

> -----Original Message-----
> From: Joe Perches <joe@...ches.com>
> Sent: Friday, May 01, 2020 5:30 PM
> To: Keller, Jacob E <jacob.e.keller@...el.com>; linux-kernel@...r.kernel.org
> Cc: Jakub Kicinski <kuba@...nel.org>; Andy Whitcroft <apw@...onical.com>
> Subject: Re: [PATCH] checkpatch: add NL_SET_ERR_MSG to 80 column
> exceptions
> 
> On Fri, 2020-05-01 at 17:19 -0700, Jacob Keller wrote:
> >
> > On 5/1/2020 4:42 PM, Joe Perches wrote:
> > > On Fri, 2020-05-01 at 16:11 -0700, Jacob Keller wrote:
> > > > NL_SET_ERR_MSG and NL_SET_ERR_MSG_MOD are used to report
> extended error
> > > > responses about failure of a netlink command. These strings often end up
> > > > going over the 80-column limit. Just like logging messages, it is
> > > > preferred to leave the message all on a single line.
> > > >
> > > > Add these to the exception list so that checkpatch.pl will no longer
> > > > complain about the long lines due to use of these macros.
> > > >
> > > > Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> > > > Cc: Jakub Kicinski <kuba@...nel.org>
> > > > Cc: Andy Whitcroft <apw@...onical.com>
> > > > Cc: Joe Perches <joe@...ches.com>
> > > > ---
> > > >  scripts/checkpatch.pl | 3 ++-
> > > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > > > index eac40f0abd56..5da3b06fbeaa 100755
> > > > --- a/scripts/checkpatch.pl
> > > > +++ b/scripts/checkpatch.pl
> > > > @@ -471,7 +471,8 @@ our $logFunctions = qr{(?x:
> > > >  	WARN(?:_RATELIMIT|_ONCE|)|
> > > >  	panic|
> > > >  	MODULE_[A-Z_]+|
> > > > -	seq_vprintf|seq_printf|seq_puts
> > > > +	seq_vprintf|seq_printf|seq_puts|
> > > > +	NL_SET_ERR_MSG(?:_MOD)?
> > > >  )};
> > > >
> > > >  our $allocFunctions = qr{(?x:
> > >
> > > <shrug>  OK I guess.
> > >
> > > What about GENL_SET_ERR_MSG ?
> > >
> >
> > This appears in far fewer locations, but it does seem reasonable to add
> > it to this list as well.
> >
> > > btw:
> > >
> > > There are some uses with what appear to be unnecessary newlines.
> > > Maybe these newlines should be removed.
> >
> > Yea, there's a number of places which seem to have put a newline break
> > after the extack pointer.
> >
> > A quick search shows that there are about 970 or so uses where we don't
> > put a newline, and around 220 where we do.
> >
> > I suppose I can make a series that cleans all of those up along with
> > this patch.
> 
> That's not what I meant.
> I don't care if there are multiple source lines used.
> In fact, I think it's mostly nicer with multiple lines.

Ah. Sure. I just noticed that one was more common than the other.

> 
> The ones I specified previously use:
> 
> 	NL_SET_ERR_MSG_MOD(extack, "message\n");
> 
> where all the others uses are:
> 
> 	NL_SET_ERR_MSG_MOD(extack, "message");
> 
> without the \n termination of the message.
> 

I see. Yea, I think the trailing newline isn't needed, but I'm not sure.

Thanks,
Jake

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