checkpatch: net and drivers/net: warn on missing blank line after variable declaration

Networking prefers this style, so warn when it's not used.

Networking uses:

    void foo(int bar)
    {
        int baz;

        code...
   }

not

    void foo(int bar)
    {
        int baz;
        code...
    }

There are a limited number of false positives when using macros to
declare variables like:

  WARNING: networking uses a blank line after declarations
  #330: FILE: net/ipv4/inet_hashtables.c:330:
  +	int dif = sk->sk_bound_dev_if;
  +	INET_ADDR_COOKIE(acookie, saddr, daddr)

Signed-off-by: Joe Perches <joe@perches.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 921c037f1968..33072d6c1b5a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2257,6 +2257,21 @@ sub process {
                              "networking block comments put the trailing */ on a separate line\n" . $herecurr);
                 }
 
+# check for missing blank lines after declarations
+                if ($realfile =~ m@^(drivers/net/|net/)@ &&
+                    $prevline =~ /^\+\s+$Declare\s+$Ident/ &&
+                    !($prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
+                      $prevline =~ /(?:\{\s*|\\)$/) &&          #extended lines
+                    $sline =~ /^\+\s+/ &&                       #Not at char 1
+                    !($sline =~ /^\+\s+$Declare/ ||
+                      $sline =~ /^\+\s+$Ident\s+$Ident/ ||      #eg: typedef foo
+                      $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
+                      $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(])/ ||
+                      $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/)) {
+                        WARN("SPACING",
+                             "networking uses a blank line after declarations\n" . $hereprev);
+                }
+
 # check for spaces at the beginning of a line.
 # Exceptions:
 #  1) within comments