linux-kernel - [PATCH v2] checkpatch: fix wildcard DT compatible string checking

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Date:	Thu, 10 Apr 2014 08:41:54 -0500
From:	Rob Herring <robherring2@...il.com>
To:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:	Rob Herring <robh@...nel.org>,
	Florian Vaussard <florian.vaussard@...l.ch>,
	Joe Perches <joe@...ches.com>,
	Andy Whitcroft <apw@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2] checkpatch: fix wildcard DT compatible string checking

From: Rob Herring <robh@...nel.org>

We attempt to search for compatible strings which use a variable
token in the documented name such as <chip> or <soc>. While this
was attempted to be handled, it's utterly broken.

The desired forms of matching are:

vendor,<chip>-*
vendor,name<part#>-*

For <chip>, lower case characters and numbers are permitted. For
<part#>, only numeric values are allowed.

With this change, the number of missing compatible strings reported in
arch/arm/boot/dts is reduced from 1071 to 960.

Reported-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Cc: Florian Vaussard <florian.vaussard@...l.ch>
Cc: Joe Perches <joe@...ches.com>
Cc: Andy Whitcroft <apw@...onical.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
v2:
- drop debugging print

 scripts/checkpatch.pl | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34eb216..62d005e 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2093,8 +2093,10 @@ sub process {
 
 			foreach my $compat (@compats) {
 				my $compat2 = $compat;
-				$compat2 =~ s/\,[a-z]*\-/\,<\.\*>\-/;
-				`grep -Erq "$compat|$compat2" $dt_path`;
+				$compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
+				my $compat3 = $compat;
+				$compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
+				`grep -Erq "$compat|$compat2|$compat3" $dt_path`;
 				if ( $? >> 8 ) {
 					WARN("UNDOCUMENTED_DT_STRING",
 					     "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
-- 
1.9.1

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