Re: [PATCH] scripts/checkpatch: emit a warning if an imported file is touched

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Jul 17, 2024 at 11:37:52AM +0200, Stefano Garzarella wrote:
> If a file imported from Linux is touched, emit a warning and suggest
> using scripts/update-linux-headers.sh
> 
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
> ---
>  scripts/checkpatch.pl | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index ff373a7083..b0e8266fa2 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1374,6 +1374,7 @@ sub process {
>  	my $in_header_lines = $file ? 0 : 1;
>  	my $in_commit_log = 0;		#Scanning lines before patch
>  	my $reported_maintainer_file = 0;
> +	my $reported_imported_file = 0;
>  	my $non_utf8_charset = 0;
>  
>  	our @report = ();
> @@ -1673,8 +1674,17 @@ sub process {
>  # ignore non-hunk lines and lines being removed
>  		next if (!$hunk_line || $line =~ /^-/);
>  
> -# ignore files that are being periodically imported from Linux
> -		next if ($realfile =~ /^(linux-headers|include\/standard-headers)\//);
> +# ignore files that are being periodically imported from Linux and emit a warning
> +		if ($realfile =~ /^(linux-headers|include\/standard-headers)\//) {
> +			if (!$reported_imported_file) {
> +				$reported_imported_file = 1;
> +				WARN("added, moved or deleted file(s) " .
> +				     "imported from Linux, are you using " .
> +				     "scripts/update-linux-headers.sh?\n" .
> +				     $herecurr);

This is a good hint, but can we add a further check that is a fatal error,
if the headers are changed in the same commit as non-header changes. When
importing headers, they should only ever be in a self-contained patch
with nothing else touched.

> +			}
> +			next;
> +		}

With regards,
Daniel
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