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-rw-r--r--mm/khugepaged.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index c13625c1ad5e..2070c316f06e 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1359,6 +1359,17 @@ static void collapse_shmem(struct mm_struct *mm,
VM_BUG_ON(index != xas.xa_index);
if (!page) {
+ /*
+ * Stop if extent has been truncated or hole-punched,
+ * and is now completely empty.
+ */
+ if (index == start) {
+ if (!xas_next_entry(&xas, end - 1)) {
+ result = SCAN_TRUNCATED;
+ break;
+ }
+ xas_set(&xas, index);
+ }
if (!shmem_charge(mapping->host, 1)) {
result = SCAN_FAIL;
break;