linux-kernel - [PATCH -next] checkpatch: Warn only on "space before semicolon" at end of line

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Date:	Wed, 04 Dec 2013 05:47:47 -0800
From:	Joe Perches <joe@...ches.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Aldo Iljazi <mail@...o.io>,
	Samuel Thibault <samuel.thibault@...-lyon.org>,
	w.d.hubbs@...il.com, chris@...-brannons.com, kirk@...sers.ca,
	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>
Subject: [PATCH -next] checkpatch: Warn only on "space before semicolon" at
 end of line

The "space before a non-naked semicolon" test has
unwanted output when used in "for ( ;; )" loops.

Make the test work only on end-of-line statement
termination semicolons.

Signed-off-by: Joe Perches <joe@...ches.com>
---
On Wed, 2013-12-04 at 11:21 +0300, Dan Carpenter wrote:
> You and I generally agree on style preferences...

True, and I think that's a good thing.

> I think the warning
> should be limited to grep " ;$".

Look at the output of:

$ git grep " ;" -- "*.[ch]"  | grep -w for
...

The "| wc -l" output above in -next is
1407

Which of those should not be warned on?

$ git grep " ;" -- "*.[ch]"  | grep -P "\bfor\s*\(\s+;" | wc -l
211

I think all of the uses like "for ( ; expression;  expression)"
are unbalanced and should be avoided.

<I go off and look at checkpatch output>

Oh.  checkpatch doesn't complain about spacing around
semicolon with for loops here.  This error is a separate
test that looks only for space before semicolon.

So, we agree after all.

This test should look only for space before end-of-statement
semicolons at EOL.

This has still has false positives with multi-line fors like:

	for ( ; expression ;
	     expression);

 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 38be5d5..d26eac6 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3131,7 +3131,7 @@ sub process {
 		}
 
 # check for whitespace before a non-naked semicolon
-		if ($line =~ /^\+.*\S\s+;/) {
+		if ($line =~ /^\+.*\S\s+;\s*$/) {
 			if (WARN("SPACING",
 				 "space prohibited before semicolon\n" . $herecurr) &&
 			    $fix) {


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