checkpatch: add control statement test to SINGLE_STATEMENT_DO_WHILE_MACRO

Commit b13edf7ff2dd ("checkpatch: add checks for do {} while (0) macro
misuses") added a test that is overly simplistic for single statement
macros.

Macros that start with control tests should be enclosed in a do {} while
(0) loop.

Add the necessary control tests to the check.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Tested-by: Franz Schrober <franzschrober@yahoo.de>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 913d6bdfdda3..ca05ba217f5f 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3016,7 +3016,8 @@ sub process {
                                         $herectx .= raw_line($linenr, $n) . "\n";
                                 }
 
-                                if (($stmts =~ tr/;/;/) == 1) {
+                                if (($stmts =~ tr/;/;/) == 1 &&
+                                    $stmts !~ /^\s*(if|while|for|switch)\b/) {
                                         WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
                                              "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
                                 }