From: Manfred Spraul <manfred@colorfullife.com>
Date: Fri, 29 Sep 2006 08:59:01 +0000 (-0700)
Subject: [PATCH] list_del debug check
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=df89a864631f5d840f4873c4c03733b4206e78ea;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] list_del debug check

A list_del() debugging check.  Has been in -mm for years.  Dave moved
list_del() out-of-line in the debug case, so this is now suitable for
mainline.

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

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 1aae85cef92c..e80d27c97898 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -59,14 +59,17 @@ EXPORT_SYMBOL(list_add);
  */
 void list_del(struct list_head *entry)
 {
+	BUG_ON(entry->prev->next != entry);
+	BUG_ON(entry->next->prev != entry);
+
 	if (unlikely(entry->prev->next != entry)) {
-		printk(KERN_ERR "list_del corruption. prev->next should be %p, but was %p\n",
-			entry, entry->prev->next);
+		printk(KERN_ERR "list_del corruption. prev->next should be %p, "
+				"but was %p\n", entry, entry->prev->next);
 		BUG();
 	}
 	if (unlikely(entry->next->prev != entry)) {
-		printk(KERN_ERR "list_del corruption. next->prev should be %p, but was %p\n",
-			entry, entry->next->prev);
+		printk(KERN_ERR "list_del corruption. next->prev should be %p, "
+				"but was %p\n", entry, entry->next->prev);
 		BUG();
 	}
 	__list_del(entry->prev, entry->next);
@@ -74,4 +77,3 @@ void list_del(struct list_head *entry)
 	entry->prev = LIST_POISON2;
 }
 EXPORT_SYMBOL(list_del);
-