Re: [PATCH] checkpatch.pl: Warn on duplicate sysctl local variable

[Joe Perches]

On Fri, 2019-05-31 at 01:51 +0200, Matteo Croce wrote:
> Commit 6a33853c5773 ("proc/sysctl: add shared variables for range check")
> adds some shared const variables to be used instead of a local copy in
> each source file.
> Warn when a chunk duplicates one of these values in a ctl_table struct:
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -6639,6 +6639,13 @@ sub process {
>  				     "unknown module license " . $extracted_string . "\n" . $herecurr);
>  			}
>  		}
> +
> +# check for sysctl duplicate constants
> +		if ($line =~ /\.extra[12]\s*=\s*&(zero|one|int_max|max_int)\b/) {
> +			my $extracted_string = get_quoted_string($line, $rawline);
> +			WARN("DUPLICATED_SYSCTL_CONST",
> +				"duplicated sysctl range checking value '$1', consider using the shared one in include/linux/sysctl.h" . $extracted_string . "\n" . $herecurr);
> +		}

why is $extracted_string used here?