[PATCH 1/4] Task notifier against mm: Allow notifier to remove itself

[Christoph Lameter]

Patch for Pavel against 2.6.13-rc3-mm3 (after removal of the TIF_FREEZE 
patch). The same patch was posted yesterday against 2.6.13-rc3. I verified
again that this patch works fine on i386.

---

Allow notifier to remove itself.
This is done by retrieving the pointer to the next notifier from the list before the
notifier call. 

Signed-off-by: Christoph Lameter <christoph@xxxxxxxxxxx>

Index: linux-2.6.13-rc3-mm3/kernel/sys.c
===================================================================
--- linux-2.6.13-rc3-mm3.orig/kernel/sys.c	2005-07-29 10:38:39.000000000 -0700
+++ linux-2.6.13-rc3-mm3/kernel/sys.c	2005-07-29 12:29:18.000000000 -0700
@@ -172,15 +172,18 @@
 {
 	int ret=NOTIFY_DONE;
 	struct notifier_block *nb = *n;
+	struct notifier_block *next;
 
 	while(nb)
 	{
-		ret=nb->notifier_call(nb,val,v);
+		/* Determining next here allows the notifier to unregister itself */
+		next = nb->next;
+		ret = nb->notifier_call(nb,val,v);
 		if(ret&NOTIFY_STOP_MASK)
 		{
 			return ret;
 		}
-		nb=nb->next;
+		nb = next;
 	}
 	return ret;
 }
-
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