[PATCH 2/3] checkstack: sort output by size and function name

[Heiko Carstens <hca@linux.ibm.com>]

Sort output by size and in addition by function name. This increases
readability for cases where there are many functions with the same stack
usage.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
 scripts/checkstack.pl | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index f27d552aec43..13408714ba0f 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -189,5 +189,20 @@ if ($total_size > $min_stack) {
 	push @stack, "$intro$total_size\n";
 }
 
-# Sort output by size (last field)
-print sort { ($b =~ /:\t*(\d+)$/)[0] <=> ($a =~ /:\t*(\d+)$/)[0] } @stack;
+# Sort output by size (last field) and function name if size is the same
+sub sort_lines {
+	my ($a, $b) = @_;
+
+	my $num_a = $1 if $a =~ /:\t*(\d+)$/;
+	my $num_b = $1 if $b =~ /:\t*(\d+)$/;
+	my $func_a = $1 if $a =~ / (.*):/;
+	my $func_b = $1 if $b =~ / (.*):/;
+
+	if ($num_a != $num_b) {
+		return $num_b <=> $num_a;
+	} else {
+		return $func_a cmp $func_b;
+	}
+}
+
+print sort { sort_lines($a, $b) } @stack;
-- 
2.39.2