Index: linux-2.6.16-mm2/include/asm-ia64/bitops.h
===================================================================
--- linux-2.6.16-mm2.orig/include/asm-ia64/bitops.h	2006-03-30 21:21:04.000000000 -0800
+++ linux-2.6.16-mm2/include/asm-ia64/bitops.h	2006-03-31 11:17:53.000000000 -0800
@@ -63,10 +63,13 @@ __set_bit (int nr, volatile void *addr)
 }
 
 /*
- * clear_bit() has "acquire" semantics.
+ * The current linux locking paradigm is oriented towards
+ * barriers. We cannot utilize acquire or relase behaviors
+ * to synchronize but must implement full barriers in order
+ * to avoid potential subtle breakage.
  */
 #define smp_mb__before_clear_bit()	smp_mb()
-#define smp_mb__after_clear_bit()	do { /* skip */; } while (0)
+#define smp_mb__after_clear_bit()	smp_mb()
 
 /**
  * clear_bit - Clears a bit in memory
Index: linux-2.6.16-mm2/mm/vmscan.c
===================================================================
--- linux-2.6.16-mm2.orig/mm/vmscan.c	2006-03-30 21:21:06.000000000 -0800
+++ linux-2.6.16-mm2/mm/vmscan.c	2006-03-31 11:23:00.000000000 -0800
@@ -174,7 +174,7 @@ unsigned long shrink_slab(unsigned long 
 	if (scanned == 0)
 		scanned = SWAP_CLUSTER_MAX;
 
-	if (!down_read_trylock(&shrinker_rwsem))
+	if (!down_write_trylock(&shrinker_rwsem))
 		return 1;	/* Assume we'll be able to shrink next time */
 
 	list_for_each_entry(shrinker, &shrinker_list, list) {
@@ -222,7 +222,7 @@ unsigned long shrink_slab(unsigned long 
 
 		shrinker->nr += total_scan;
 	}
-	up_read(&shrinker_rwsem);
+	up_write(&shrinker_rwsem);
 	return ret;
 }