1 files changed, 7 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4de4bc48493b..a820249a3fce 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3477,6 +3477,13 @@ sub process {
                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
                 }
 
+# check for krealloc arg reuse
+                if ($^V && $^V ge 5.10.0 &&
+                    $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
+                        WARN("KREALLOC_ARG_REUSE",
+                             "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
+                }
+
 # check for alloc argument mismatch
                 if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
                         WARN("ALLOC_ARRAY_ARGS",