checkpatch: improve OPEN_BRACE test

Some structure definitions that use macros trip the OPEN_BRACE test.

e.g. +struct bpf_map_def SEC("maps") control_map = {

Improve the test by using $balanced_parens instead of a .*

Miscellanea:

o Use $sline so any comments are ignored
o Correct the message output from declaration to definition
o Remove unnecessary parentheses

Link: http://lkml.kernel.org/r/db9b772999d1d2fbda3b9ee24bbca81a87837e13.1517543491.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Song Liu <songliubraving@fb.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 78e7a31..3d40403 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3919,10 +3919,12 @@ sub process {
 
 # function brace can't be on same line, except for #defines of do while,
 # or if closed on same line
-               if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and
-                   !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
+               if ($^V && $^V ge 5.10.0 &&
+                   $sline =~ /$Type\s*$Ident\s*$balanced_parens\s*\{/ &&
+                   $sline !~ /\#\s*define\b.*do\s*\{/ &&
+                   $sline !~ /}/) {
                        if (ERROR("OPEN_BRACE",
-                                 "open brace '{' following function declarations go on the next line\n" . $herecurr) &&
+                                 "open brace '{' following function definitions go on the next line\n" . $herecurr) &&
                            $fix) {
                                fix_delete_line($fixlinenr, $rawline);
                                my $fixed_line = $rawline;