checkpatch: don't emit the CamelCase warning for PageFoo

I'm getting a ton of these:

  WARNING: Avoid CamelCase: <PageTransHuge>
  #140: FILE: mm/migrate.c:1576:
  +       if (PageTransHuge(page) && page_count(page) != 3) {

So exclude anything which starts with "Page".

Tested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3dcfbc9..2c50eb4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2930,6 +2930,7 @@
 			my $var = $1;
 			if ($var !~ /$Constant/ &&
 			    $var =~ /[A-Z]\w*[a-z]|[a-z]\w*[A-Z]/ &&
+			    $var !~ /^Page[A-Z]/ &&
 			    !defined $camelcase{$var}) {
 				$camelcase{$var} = 1;
 				WARN("CAMELCASE",