--- mm/vmalloc.c

+++ mm/vmalloc.c

@@ -513,6 +513,15 @@ static atomic_t vmap_lazy_nr = ATOMIC_IN

static void purge_fragmented_blocks_allcpus(void);

/*

+ * called before a call to iounmap() if the caller wants vm_area_struct's

+ * immediately freed.

+ */

+void set_iounmap_nonlazy(void)

+{

+ atomic_set(&vmap_lazy_nr, lazy_max_pages()+1);

+}

+

+/*

* Purges all lazily-freed vmap areas.

*

* If sync is 0 then don't purge if there is already a purge in progress.