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-rw-r--r--mm/vmalloc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 4fa8d84599b0..e0fc963acc41 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1259,6 +1259,12 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
return false;
/*
+ * First make sure the mappings are removed from all page-tables
+ * before they are freed.
+ */
+ vmalloc_sync_all();
+
+ /*
* TODO: to calculate a flush range without looping.
* The list can be up to lazy_max_pages() elements.
*/
@@ -3038,6 +3044,9 @@ EXPORT_SYMBOL(remap_vmalloc_range);
/*
* Implement a stub for vmalloc_sync_all() if the architecture chose not to
* have one.
+ *
+ * The purpose of this function is to make sure the vmalloc area
+ * mappings are identical in all page-tables in the system.
*/
void __weak vmalloc_sync_all(void)
{