scripts: get_abi.pl: add an option to filter undefined results

The output of this script can be too big. Add an option to
filter out results, in order to help finding issues at the
ABI files.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/7b56c10195bb5e5dfd8b5838a3db8d361231d884.1631957565.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/get_abi.pl

@@ -18,6 +18,7 @@ my $enable_lineno = 0;
 my $show_warnings = 1;
 my $prefix="Documentation/ABI";
 my $sysfs_prefix="/sys";
+my $search_string;
 
 #
 # If true, assumes that the description is formatted with ReST
@@ -31,6 +32,7 @@ GetOptions(
 	"dir=s" => \$prefix,
 	'help|?' => \$help,
 	"show-hints" => \$hint,
+	"search-string=s" => \$search_string,
 	man => \$man
 ) or pod2usage(2);
 
@@ -568,16 +570,13 @@ sub parse_existing_sysfs {
 sub check_undefined_symbols {
 	foreach my $file (sort @files) {
 
-		# sysfs-module is special, as its definitions are inside
-		# a text. For now, just ignore them.
-		next if ($file =~ m#^/sys/module/#);
-
 		# Ignore cgroup and firmware
 		next if ($file =~ m#^/sys/(fs/cgroup|firmware)/#);
 
 		my $defined = 0;
 		my $exact = 0;
 		my $whats = "";
+		my $found_string;
 
 		my $leave = $file;
 		$leave =~ s,.*/,,;
@@ -585,6 +584,12 @@ sub check_undefined_symbols {
 		my $path = $file;
 		$path =~ s,(.*/).*,$1,;
 
+		if ($search_string) {
+			next if (!($file =~ m#$search_string#));
+			$found_string = 1;
+		}
+
+		print "--> $file\n" if ($found_string && $hint);
 		if (defined($leaf{$leave})) {
 			my $what = $leaf{$leave};
 			$whats .= " $what" if (!($whats =~ m/$what/));
@@ -610,6 +615,7 @@ sub check_undefined_symbols {
 				if (substr($file, 0, $len) eq $new) {
 					my $newf = $a . substr($file, $len);
 
+					print "    $newf\n" if ($found_string && $hint);
 					foreach my $w (split / /, $what) {
 						if ($newf =~ m#^$w$#) {
 							$exact = 1;
@@ -632,10 +638,10 @@ sub check_undefined_symbols {
 		next if ($file =~ m#/parameters/#);
 
 		if ($hint && $defined) {
-			print "$leave at $path might be one of:$whats\n";
+			print "$leave at $path might be one of:$whats\n"  if (!$search_string || $found_string);
 			next;
 		}
-		print "$file not found.\n";
+		print "$file not found.\n" if (!$search_string || $found_string);
 	}
 }
 
@@ -701,16 +707,29 @@ sub undefined_symbols {
 			$what =~ s/\\([\[\]\(\)\|])/$1/g;
 			$what =~ s/(\d+)\\(-\d+)/$1$2/g;
 
+			$what =~ s/\xff/\\d+/g;
+
+
+			# Special case: IIO ABI which a parenthesis.
+			$what =~ s/sqrt(.*)/sqrt\(.*\)/;
+
 			$leave =~ s/[\(\)]//g;
 
+			my $added = 0;
 			foreach my $l (split /\|/, $leave) {
 				if (defined($leaf{$l})) {
 					next if ($leaf{$l} =~ m/$what/);
 					$leaf{$l} .= " " . $what;
+					$added = 1;
 				} else {
 					$leaf{$l} = $what;
+					$added = 1;
 				}
 			}
+			if ($search_string && $added) {
+				print "What: $what\n" if ($what =~ m#$search_string#);
+			}
+
 		}
 	}
 	check_undefined_symbols;
@@ -764,6 +783,7 @@ abi_book.pl - parse the Linux ABI files and produce a ReST book.
 
 B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
 	       [--(no-)rst-source] [--dir=<dir>] [--show-hints]
+	       [--search-string <regex>]
 	       <COMAND> [<ARGUMENT>]
 
 Where <COMMAND> can be:
@@ -811,6 +831,11 @@ times, to increase verbosity.
 Show hints about possible definitions for the missing ABI symbols.
 Used only when B<undefined>.
 
+=item B<--search-string> [regex string]
+
+Show only occurences that match a search string.
+Used only when B<undefined>.
+
 =item B<--help>
 
 Prints a brief help message and exits.