Re: [PATCH] checkpatch: check for missing \n at the end of logging message

[Joe Perches <joe@perches.com>]

On Fri, 2020-04-10 at 19:35 +0200, Christophe JAILLET wrote:
> Le 08/04/2020 à 04:14, Joe Perches a écrit :
> > This works rather better:
> > Perhaps you could test?
[]
> I'm looking at some modification done in the last month that could have 
> been spotted by the above script.
> 
>      ./scripts/checkpatch.pl -f drivers/usb/phy/phy-jz4770.c
> 
> correctly spots the 3 first cases, but the 3 last (line 202, 210 and 
> 217) are missed.
> I don't understand why.

It has to do with checkpatch's single statement parsing.

This case:

	if (foo)
		dev_warn(...);

is parsed as a single statement but

	if (foo) {
		dev_warn(...);
	};

is parsed as multiple statements so for the
second case

		dev_warn(...);

is analyzed as a separate statement.

The regex match for this missing newline test expects
that each printk is a separate statement so the first
case doesn't match.

Clearly the regex can be improved here.

cheers, Joe