checkpatch: handle EXPORT_SYMBOL for DEVICE_ATTR and similar

Handly definitions similar to below.  The definition macro spits out a
symbol with a prefix.  Add matching of any identifier prefix:

    DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
            ata_scsi_lpm_show, ata_scsi_lpm_put);
    EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
Signed-off-by: NAndy Whitcroft <apw@canonical.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -1822,8 +1822,17 @@ sub process {
 		    !defined $suppress_export{$realline_next} &&
 		    ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
 		     $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
+			# Handle definitions which produce identifiers with
+			# a prefix:
+			#   XXX(foo);
+			#   EXPORT_SYMBOL(something_foo);
 			my $name = $1;
-			if ($stat !~ /(?:
+			if ($stat =~ /^.([A-Z_]+)\s*\(\s*($Ident)/ &&
+			    $name =~ /^${Ident}_$2/) {
+#print "FOO C name<$name>\n";
+				$suppress_export{$realline_next} = 1;
+
+			} elsif ($stat !~ /(?:
 				\n.}\s*$|
 				^.DEFINE_$Ident\(\Q$name\E\)|
 				^.DECLARE_$Ident\(\Q$name\E\)|