Re: [iio:togreg 3/3] WARNING: Reusing the krealloc arg is almost always a bug

[Joe Perches <joe@perches.com>]

That last one doesn't work if the krealloc has a cast like
	foo = (struct bar *)krealloc(foo, 1, GFP_KERNEL)
Maybe this one is better...
---
 scripts/checkpatch.pl | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 91308be..43914c3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4275,9 +4275,20 @@ sub process {
 
 # 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);
+		    $line =~ /($Lval)\s*\=\s*($balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
+			my $cast = $2;
+			my $cast_count = 0;
+			my @line_lvals = $line =~ m/$Lval/g;
+			if (defined $cast) {
+				$cast_count++ while ($cast =~ /$Lval/g);
+			}
+			for my $index (1 + $cast_count .. $#line_lvals - 1) {
+				if ($line_lvals[$index] eq "krealloc" &&
+				    $line_lvals[$index - 1 - $cast_count] eq $line_lvals[$index + 1]) {
+					WARN("KREALLOC_ARG_REUSE",
+					     "Reusing the krealloc arg is almost always a bug\n" . $herecurr);
+				}
+			}
 		}
 
 # check for alloc argument mismatch