linux-kernel - [PATCH 1/5] checkpatch: fix false errors due to macro concatenation

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Date:	Mon, 21 Sep 2009 19:14:47 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org,
	Daniel Walker <dwalker@...o99.com>
Subject: [PATCH 1/5] checkpatch: fix false errors due to macro concatenation

The macro concatenation (##) sequence can cause false errors when checking
macro's. Checkpatch doesn't currently know about the operator.

For example this line,

+ 	entry = (struct ftrace_raw_##call *)raw_data;                   \

is correct but it produces the following error,

ERROR: need consistent spacing around '*' (ctx:WxB)
+       entry = (struct ftrace_raw_##call *)raw_data;\
                                          ^

The line above doesn't have any spacing problems, and if you remove the
macro concatenation sequence checkpatch doesn't give any errors. This change
resolves this by just always removing "##" in every line checked.

Signed-off-by: Daniel Walker <dwalker@...o99.com>
---
 scripts/checkpatch.pl |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2d5ece7..09bab22 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -397,6 +397,11 @@ sub sanitise_line {
 		$res =~ s@(\#\s*(?:error|warning)\s+).*@...clean@;
 	}
 
+	# The macro concatenation sequence is unique so we can just delete it.
+	# If it's not deleted it screws up the rest of the matching and can
+	# result in false errors.
+	$res =~ s/($Ident|\s)\s*\#\#\s*($Ident|\s)/$1$2/g;
+
 	return $res;
 }
 
-- 
1.5.6.3

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