linux-kernel - [PATCH] checkpatch: Add 'Prefer ARRAY

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Message-ID: <1428421533.20888.111.camel@perches.com>
Date:	Tue, 07 Apr 2015 08:45:33 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andy Whitcroft <apw@...dowen.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] checkpatch: Add 'Prefer ARRAY_SIZE" test

Add a test for sizeof(foo)/sizeof(foo[0]) that could
be ARRAY_SIZE(foo).

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9a8b2bd..d2e9752 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3226,6 +3226,19 @@ sub process {
 				$herecurr);
                }
 
+# check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
+		if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
+			my $array = $1;
+			if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
+				my $array_div = $1;
+				if (WARN("ARRAY_SIZE",
+					 "Prefer ARRAY_SIZE($array)\n" . $herecurr) &&
+				    $fix) {
+					$fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
+				}
+			}
+		}
+
 # check for function declarations without arguments like "int foo()"
 		if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
 			if (ERROR("FUNCTION_WITHOUT_ARGS",


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