checkpatch: warn on unnecessary parentheses around references of foo->bar

Parentheses around &(foo->bar) and *(foo->bar) are unnecessary.  Emit a
--strict only message on these uses.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index df4250a8ad51..9a89a0609bac 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3491,6 +3491,14 @@ sub process {
                         }
                 }
 
+# check unnecessary parentheses around addressof/dereference single $Lvals
+# ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar
+
+                while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) {
+                        CHK("UNNECESSARY_PARENTHESES",
+                            "Unnecessary parentheses around $1\n" . $herecurr);
+                    }
+
 #goto labels aren't indented, allow a single space however
                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {