checkpatch: warn on unnecessary line continuations

When the previous line is not a line continuation and the current line has
a line continuation but is not a #define, emit a warning.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f18750e3bd6c..d4f61a6fed5d 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3013,6 +3013,15 @@ sub process {
                                               "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
                                 }
                         }
+
+# check for line continuations outside of #defines
+
+                } else {
+                        if ($prevline !~ /^..*\\$/ &&
+                            $line =~ /^\+.*\\$/) {
+                                WARN("LINE_CONTINUATIONS",
+                                     "Avoid unnecessary line continuations\n" . $herecurr);
+                        }
                 }
 
 # do {} while (0) macro tests: