checkpatch: check spacing for square brackets

Check on the spacing before square brackets.  We should only allow spaces
there if this is part of a type definition or an initialialiser.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5f71b3050253..e7c8ab1b54bd 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1435,6 +1435,17 @@ sub process {
                         ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
                 }
 
+# check for spacing round square brackets; allowed:
+#  1. with a type on the left -- int [] a;
+#  2. at the beginning of a line for slice initialisers -- [0..10] = 5,
+                while ($line =~ /(.*?\s)\[/g) {
+                        my ($where, $prefix) = ($-[1], $1);
+                        if ($prefix !~ /$Type\s+$/ &&
+                            ($where != 0 || $prefix !~ /^.\s+$/)) {
+                                ERROR("space prohibited before open square bracket '['\n" . $herecurr);
+                        }
+                }
+
 # check for spaces between functions and their parentheses.
                 while ($line =~ /($Ident)\s+\(/g) {
                         my $name = $1;