Re: [PATCH] checkpatch: warn when patch exceeds a maximum message size

[Joe Perches <joe@perches.com>]

On Thu, 2014-06-05 at 17:00 -0700, Bruce Allan wrote:
> the maximum message size (100,000 characters) allowed by Majordomo at
> vger.kernel.org since that is where most Linux email lists are served.

I believe this is incorrect and the patch is unnecessary.

It'd maybe more interesting if the email header sizes
were calculated and if > 1024, then some bleating message
were emitted.

> Also provide a command-line option to specify a different maximum size.
> 
> Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
> ---
> 
>  scripts/checkpatch.pl |   15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 34eb216..79bd7fd6 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -40,6 +40,7 @@ my @ignore = ();
>  my $help = 0;
>  my $configuration_file = ".checkpatch.conf";
>  my $max_line_length = 80;
> +my $max_msg_size = 100000;	# Max allowed by Majordomo at vger.kernel.org
>  my $ignore_perl_version = 0;
>  my $minimum_perl_version = 5.10.0;
>  
> @@ -62,6 +63,7 @@ Options:
>    --types TYPE(,TYPE2...)    show only these comma separated message types
>    --ignore TYPE(,TYPE2...)   ignore various comma separated message types
>    --max-line-length=n        set the maximum line length, if exceeded, warn
> +  --max-msg-size=n           set the maximum message size, if exceeded, warn
>    --show-types               show the message "types" in the output
>    --root=PATH                PATH to the kernel tree root
>    --no-summary               suppress the per-file summary
> @@ -130,6 +132,7 @@ GetOptions(
>  	'types=s'	=> \@use,
>  	'show-types!'	=> \$show_types,
>  	'max-line-length=i' => \$max_line_length,
> +	'max-msg-size=i' => \$max_msg_size,
>  	'root=s'	=> \$root,
>  	'summary!'	=> \$summary,
>  	'mailback!'	=> \$mailback,
> @@ -4600,6 +4603,18 @@ sub process {
>  		exit(0);
>  	}
>  
> +	# Warn if patch exceeds the maximum message size
> +	if (!$file) {
> +		my $cnt_chars = 0;
> +		foreach my $rawline (@rawlines) {
> +			$cnt_chars += length($rawline) + 1;
> +		}
> +		if ($cnt_chars > $max_msg_size) {
> +			WARN("PATCH_TOO_LARGE",
> +			     "patch exceeds maximum message size ($max_msg_size) and might be blocked by email list server(s).\n");
> +		}
> +	}
> +
>  	if (!$is_patch) {
>  		ERROR("NOT_UNIFIED_DIFF",
>  		      "Does not appear to be a unified-diff format patch\n");
>