[RESEND][PATCH] checkpatch: make sure fix-up patches have Fixes tag

[Sergey Senozhatsky]

If a patch contains "commit hash (commit name)", in other words
if the patch fixes some particular commit, then require "Fixes:"
tag.

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Change-Id: I066ae0e607a67ac83c6ba0ff8d883f7e7a4a73e0
---
 scripts/checkpatch.pl | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index df8b23dc1eb0..4e97d0f6b995 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2493,6 +2493,9 @@ sub process {
 	my $commit_log_has_diff = 0;
 	my $reported_maintainer_file = 0;
 	my $non_utf8_charset = 0;
+	my $fixes_id = 0;
+	my $fixes_description = 0;
+	my $fixes_tag = 0;
 
 	my $last_blank_line = 0;
 	my $last_coalesced_string_linenr = -1;
@@ -3076,6 +3079,11 @@ sub process {
 			}
 		}
 
+# Check for Fixes tag
+		if ($in_commit_log && $line =~ /\b[Ff]ixes:\s*[0-9a-f]{12,40}/) {
+			$fixes_tag = 1;
+		}
+
 # Check for git id commit length and improperly formed commit descriptions
 		if ($in_commit_log && !$commit_log_possible_stack_dump &&
 		    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink|base-commit):/i &&
@@ -3128,6 +3136,11 @@ sub process {
 			($id, $description) = git_commit_info($orig_commit,
 							      $id, $orig_desc);
 
+			if (defined($id)) {
+				$fixes_id = $id;
+				$fixes_description = $description;
+			}
+
 			if (defined($id) &&
 			   ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens)) {
 				ERROR("GIT_COMMIT_ID",
@@ -7326,6 +7339,12 @@ sub process {
 		}
 	}
 
+	if ($is_patch && $has_commit_log && $fixes_id && !$fixes_tag) {
+		ERROR("GIT_COMMIT_ID",
+		      "Please add 'Fixes: $fixes_id (\"$fixes_description\")'\n", );
+		$fixes_id = 0;
+	}
+
 	print report_dump();
 	if ($summary && !($clean == 1 && $quiet == 1)) {
 		print "$filename " if ($summary_file);
-- 
2.34.1.703.g22d0c6ccf7-goog