linux-kernel - [PATCH] checkpatch: Warn on uses of __constant

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Message-ID: <1392209209.1868.16.camel@joe-AO722>
Date:	Wed, 12 Feb 2014 04:46:49 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...onical.com>
Cc:	Simon Wunderlich <sw@...onwunderlich.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] checkpatch: Warn on uses of __constant_<foo> functions

Emit a warning when using any of these __constant_<foo> forms:

	__constant_cpu_to_be[x]
	__constant_cpu_to_le[x]
	__constant_be[x]_to_cpu
	__constant_le[x]_to_cpu
	__constant_htons
	__constant_ntohs

Using any of these outside of include/uapi/ isn't preferred
as using the function without __constant_ is identical when
the argument is a constant.

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 464dcef..8a5c49b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3910,6 +3910,19 @@ sub process {
 			}
 		}
 
+# don't use __constant_<foo> functions outside of include/uapi/
+		if ($realfile !~ m@...clude/uapi/@ &&
+		    $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
+			my $constant_func = $1;
+			my $func = $constant_func;
+			$func =~ s/^__constant_//;
+			if (WARN("CONSTANT_CONVERSION",
+				 "$constant_func should be $func\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$linenr - 1] =~ s/\b$constant_func\b/$func/g;
+			}
+		}
+
 # prefer usleep_range over udelay
 		if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
 			# ignore udelay's < 10, however


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