linux-kernel - [PATCH] checkpatch.pl: fix CAST detection to not screw with parens handling

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Date:	Wed,  3 Nov 2010 13:04:33 +0100
From:	Florian Mickler <florian@...kler.org>
To:	Andy Whitcroft <apw@...onical.com>
Cc:	Audun Hoem <audun.hoem@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>
Subject: [PATCH] checkpatch.pl: fix CAST detection to not screw with parens handling

Casts have to be handled after the last type that is followed by an
opening parenthesis is handled.

On Tue, 2 Nov 2010 23:57:36 +0100
Audun Hoem <audun.hoem@...il.com> wrote:

> I have stumbled about a bug in checkpatch.pl while working on some
> code in drivers/staging. It seems to get confused when confronted with
> asterisks. For example, this snippe:
>
> kmalloc(sizeof(struct alphatrack_ocmd) * true_size, GFP_KERNEL);
>
> Here the asterisk is in it's binary form, obviously, and performs a
> multiplication, however checkpatch reports this:
>
> drivers/staging/frontier/alphatrack.c:772: ERROR: space prohibited
> after that '*' (ctx:WxW)
>
> So it's obviously thinking it's the unary operator, which should only
> be preceded by a variable name or another unary operator such as ++.

Reported-By: Audun Hoem <audun.hoem@...il.com>

Signed-off-by: Florian Mickler <florian@...kler.org>
---
 scripts/checkpatch.pl |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 90b54d4..c1cbb09 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -859,10 +859,6 @@ sub annotate_values {
 				$av_preprocessor = 0;
 			}
 
-		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/) {
-			print "CAST($1)\n" if ($dbg_values > 1);
-			push(@av_paren_type, $type);
-			$type = 'C';
 
 		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
 			print "DECLARE($1)\n" if ($dbg_values > 1);
@@ -963,6 +959,13 @@ sub annotate_values {
 			$type = 'V';
 			$av_pending = 'V';
 
+		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/) {
+			#casts handled after last type that opens a brace
+			#is handled, else it screws up the parens handling
+			print "CAST($1)\n" if ($dbg_values > 1);
+			push(@av_paren_type, $type);
+			$type = 'C';
+
 		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
 			if (defined $2 && $type eq 'C' || $type eq 'T') {
 				$av_pend_colon = 'B';
-- 
1.7.3.1

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