checkpatch.pl: warn if an adding line introduce spaces before tabs.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Andy Whitcroft <apw@shadowen.org>
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 1a93ac2..cf4e44c 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1422,6 +1422,12 @@ sub process {
                        ERROR("code indent should use tabs where possible\n" . $herevet);
                }
 
+# check for space before tabs.
+               if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
+                       my $herevet = "$here\n" . cat_vet($rawline) . "\n";
+                       WARN("please, no space before tabs\n" . $herevet);
+               }
+
 # check we are in a valid C source file if not then ignore this hunk
                next if ($realfile !~ /\.(h|c)$/);