--- linux/fs/inode.c.orig	2009-01-24 03:28:57.000000000 +0800
+++ linux/fs/inode.c	2009-01-24 03:30:18.000000000 +0800
@@ -418,7 +418,9 @@ static void prune_icache(int nr_to_scan)
 	int nr_scanned;
 	unsigned long reap = 0;
 
-	mutex_lock(&iprune_mutex);
+	if (!mutex_trylock(&iprune_mutex))
+		return;
+
 	spin_lock(&inode_lock);
 	for (nr_scanned = 0; nr_scanned < nr_to_scan; nr_scanned++) {
 		struct inode *inode;