checkpatch: add --strict test for precedence challenged macro arguments

Add a test for macro arguents that have a non-comma leading or trailing
operator where the argument isn't parenthesized to avoid possible precedence
issues.

Link: http://lkml.kernel.org/r/47715508972f8d786f435e583ff881dbeee3a114.1473745855.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f135f8e..ea1a7ad 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4836,7 +4836,7 @@ sub process {
 # check if any macro arguments are reused (ignore '...' and 'type')
                        foreach my $arg (@def_args) {
                                next if ($arg =~ /\.\.\./);
-                               next if ($arg =~ /^type$/);
+                               next if ($arg =~ /^type$/i);
                                my $tmp = $define_stmt;
                                $tmp =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g;
                                $tmp =~ s/\#\s*$arg\b//g;
@@ -4845,6 +4845,13 @@ sub process {
                                if ($use_cnt > 1) {
                                        CHK("MACRO_ARG_REUSE",
                                            "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx");
+                                   }
+# check if any macro arguments may have other precedence issues
+                               if ($define_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m &&
+                                   ((defined($1) && $1 ne ',') ||
+                                    (defined($2) && $2 ne ','))) {
+                                       CHK("MACRO_ARG_PRECEDENCE",
+                                           "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx");
                                }
                        }