[PATCH 4/4] leaking_addresses: add scan_once array

[Tobin C. Harding]

There are files under /proc that have the same format for each PID, e.g
'smaps'.  We need only scan these files a single time to verify that
they are not leaking addresses.  This reduces the work the script must
do.

Add once_only array.

Signed-off-by: Tobin C. Harding <m...@tobin.cc>
---
 scripts/leaking_addresses.pl | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
index f52e91ef7d5c..ab4e70d9efde 100755
--- a/scripts/leaking_addresses.pl
+++ b/scripts/leaking_addresses.pl
@@ -69,6 +69,12 @@ my @skip_any = (
        'fd',
        'usbmon');
 
+# These files are the same format under each PID that they appear.
+# We need only pass them once.
+my @once_only = (
+       'smaps',
+       'mb_groups');
+
 sub help
 {
        my ($exitcode) = @_;
@@ -401,6 +407,25 @@ sub parse_dmesg
        close $cmd;
 }
 
+sub already_scanned
+{
+       my ($filename) = @_;
+       state %seen;
+
+       foreach (@once_only) {
+               if (/^$filename$/) {
+                       if ($seen{$_} == 1) {
+                               return 1;
+                       }
+                       $seen{$_} = 1;
+
+                       return 0;
+               }
+       }
+
+       return 0;
+}
+
 # True if we should skip this path.
 sub skip
 {
@@ -415,6 +440,10 @@ sub skip
                return 1 if (/^$filename$/);
        }
 
+       if (already_scanned($filename)) {
+               return 1;
+       }
+
        return 0;
 }
 
-- 
2.7.4