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Subject: Re: Checkpatch ignores spelling error by using -f
From: Joe Perches <joe@perches.com>
To: Rolf Evers-Fischer <embedded24@evers-fischer.de>, apw@canonical.com,
        linux-kernel@vger.kernel.org
Date: Wed, 06 Dec 2017 06:52:34 -0800
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On Wed, 2017-12-06 at 15:13 +0100, Rolf Evers-Fischer wrote:
> Hello,
> I've just checked the file drivers/tty/serial/8250/8250_omap.c, using 
> checkpatch.pl, but I forgot the '-f' option (for file).
> 
> Surprisingly the checkpatch script reported a misspelling:
> 
> "WARNING: 'additionaly' may be misspelled - perhaps 'additionally'?
> #417: 
>          * We enable TRIG_GRANU for RX and TX and additionaly we set"
> 
> Additionally it reported that the file does not appear to be a 
> unified-diff (due to my mistake).
> 
> Running checkpatch again with '-f', it didn't report any problems:
> 
> "drivers/tty/serial/8250/8250_omap.c has no obvious style problems and is 
> ready for submission."
> 
> Is this a bug in checkpatch.pl? Or is it a feature?

feature.  kinda.

checkpatch reports spelling errors in commit messages.

Without the -f, checkpatch is reading its input as a
commit message before expecting to find a diff/patch.