[PATCH] More list debugging context

Print the other (hopefully) known good pointer when list_head debugging
too, which may yield additional clues.

Also fix for 80-columns to win akpm brownie points.

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 7ba9d823d388..4350ba9655bd 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -21,13 +21,15 @@ void __list_add(struct list_head *new,
                               struct list_head *next)
 {
         if (unlikely(next->prev != prev)) {
-                printk(KERN_ERR "list_add corruption. next->prev should be %p, but was %p\n",
-                        prev, next->prev);
+                printk(KERN_ERR "list_add corruption. next->prev should be "
+                        "prev (%p), but was %p. (next=%p).\n",
+                        prev, next->prev, next);
                 BUG();
         }
         if (unlikely(prev->next != next)) {
-                printk(KERN_ERR "list_add corruption. prev->next should be %p, but was %p\n",
-                        next, prev->next);
+                printk(KERN_ERR "list_add corruption. prev->next should be "
+                        "next (%p), but was %p. (prev=%p).\n",
+                        next, prev->next, prev);
                 BUG();
         }
         next->prev = new;