linux-kernel - Re: [PATCH v2] checkpatch: Add a warning for log messages that don't end in a new line

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Date:   Mon, 27 Nov 2017 09:41:16 -0800
From:   Joe Perches <joe@...ches.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        Julia Lawall <julia.lawall@...6.fr>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH v2] checkpatch: Add a warning for log messages that
 don't end in a new line

On Mon, 2017-11-27 at 10:33 -0700, Logan Gunthorpe wrote:
> > > This is a valid false positive that I also missed. However, it can
> > > actually be very easily ignored by checking if the format string ends in
> > > %pV. There were about 100 cases in my results that match this.
> > 
> > No, it can't be done that way.
> > 
> > $ git grep '%pV\\n"' | wc -l
> > 56
> > $ git grep '%pV"' | wc -l
> > 146
> > 
> > AFAIK: all of the above are correct as-is.
> 
> Yes, I'm saying they are correct too. So the script would very easily 
> notice this and not produce a warning. The first grep you did already 
> weren't false positives because they ended in \\n and wouldn't have 
> produced a warning. A very simple change to my patch ignores the second 
> group. So what's wrong here?

It can't be determined if the vaf.fmt contains a \n termination.