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 <[email protected]> Cc: Andy Whitcroft <[email protected]> Cc: Simon Wunderlich <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
Baughn · Apr 3, 2014 · fbdb813 · fbdb813
1 parent 2435880
commit fbdb813
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
@@ -3931,6 +3931,19 @@ sub process {
 			}
 		}
 
+# don't use __constant_<foo> functions outside of include/uapi/
+		if ($realfile !~ m@^include/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*\(\s*(\d+)\s*\)/) {
 			my $delay = $1;