[RFC] Resolving "false positive" error message from checkpatch.pl

[Greg KH]

On Fri, Feb 03, 2017 at 11:11:35AM +0100, Slawomir Stepien wrote:
> Hi all
> 
> There is a "false positive" error reported by checkpatch.pl:
> 
> ERROR: Use 4 digit octal (0777) not decimal permissions
> #272: FILE: drivers/staging/iio/meter/ade7759.c:272:
> +static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,
> +		ade7759_read_8bit,
> +		ade7759_write_8bit,
> +		ADE7759_CH1OS);
> 
> ERROR: Use 4 digit octal (0777) not decimal permissions
> #276: FILE: drivers/staging/iio/meter/ade7759.c:276:
> +static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,
> +		ade7759_read_8bit,
> +		ade7759_write_8bit,
> +		ADE7759_CH2OS);
> 
> The same for the file drivers/staging/iio/meter/ade7753.c.
> 
> We can see that this macro is matched by the pattern "IIO_DEV_ATTR_[A-Z_]+" from
> @mode_permission_funcs in checkpatch.pl.
> 
> My question is: how this should be fixed?

Why do you think this is a false-positive?

> From what I can say, it's a false positive so the correct way to fix it is to
> change the matching pattern: "IIO_DEV_ATTR_(?!CH_OFF)[A-Z_]+".

Huh?

Provide a patch to show what you are suggesting please.

thanks,

greg k-h