On Fri, 1 Jun 2012, KOSAKI Motohiro wrote:

quoted

  	mlock_migrate_page(newpage, page);

--- 3.4.0+/mm/page-writeback.c	2012-05-29 08:09:58.304806782 -0700
+++ linux/mm/page-writeback.c	2012-06-01 00:23:43.984116973 -0700

@@ -1987,7 +1987,10 @@ int __set_page_dirty_nobuffers(struct pa
  		mapping2 = page_mapping(page);
  		if (mapping2) { /* Race with truncate? */
  			BUG_ON(mapping2 != mapping);
-			WARN_ON_ONCE(!PagePrivate(page)&&

!PageUptodate(page));
+			if (WARN_ON(!PagePrivate(page)&&
!PageUptodate(page)))
+				print_symbol(KERN_WARNING
+				    "mapping->a_ops->writepage: %s\n",
+				    (unsigned
long)mapping->a_ops->writepage);

type mismatch?

I don't think so: I just copied from print_bad_pte().
Probably you're reading "printk" where it's "print_symbol"?

I guess you want %pf or %pF.

I expect there is new-fangled %pMagic that can do it too, yes.

Hugh

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