checkpatch: add check for `while` and `for`

Adding check for `while` and `for` statements, which condition has more than
one line.

The former checkpatch.pl can check `if` statement, which condition has more
than one line, whether block misses brace round, like this:
'''
if (cond1 ||
    cond2)
    statement;
'''
But it doesn't do the same check for `for` and `while` statements.

Using `(?:...)` instead of `(...)` in regex pattern catch.
Because `(?:...)` is faster and avoids unwanted side-effect.

Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Suggested-by: Eric Blake <eblake@redhat.com>
Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Su Hang <suhang16@mails.ucas.ac.cn>
Message-Id: <1520319890-19761-1-git-send-email-suhang16@mails.ucas.ac.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a88af61ed4ee33b3250b85f600abd17e82d9ac7c..d1fe79bcc47cc1a02863f94be140a634fde48184 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2352,8 +2352,9 @@ sub process {
                        }
                }
 
-# check for missing bracing round if etc
-               if ($line =~ /(^.*)\bif\b/ && $line !~ /\#\s*if/) {
+# check for missing bracing around if etc
+               if ($line =~ /(^.*)\b(?:if|while|for)\b/ &&
+                       $line !~ /\#\s*if/) {
                        my ($level, $endln, @chunks) =
                                ctx_statement_full($linenr, $realcnt, 1);
                         if ($dbg_adv_apw) {