checkpatch: add --strict test for concatenated string elements

Using a space between concatenated string elements is easier for a human
to read.

ie:
	"String"FOO"bar"

is easier to read as:

	"String" FOO "bar"

So suggest this style with a --strict command line option.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 969b365f8690..9846ddeafdf0 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4344,6 +4344,12 @@ sub process {
                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
                 }
 
+# concatenated string without spaces between elements
+                if ($line =~ /"X+"[A-Z_]+/ || $line =~ /[A-Z_]+"X+"/) {
+                        CHK("CONCATENATED_STRING",
+                            "Concatenated strings should use spaces between elements\n" . $herecurr);
+                }
+
 # warn about #if 0
                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
                         CHK("REDUNDANT_CODE",