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-rw-r--r--mm/mmap.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 376492ed08f4..e02f1aa66a1a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -27,6 +27,7 @@
#include <linux/mount.h>
#include <linux/mempolicy.h>
#include <linux/rmap.h>
+#include <linux/ksm.h>
#include <linux/mmu_notifier.h>
#include <linux/perf_event.h>
@@ -2111,6 +2112,14 @@ void exit_mmap(struct mm_struct *mm)
/* Use -1 here to ensure all VMAs in the mm are unmapped */
end = unmap_vmas(&tlb, vma, 0, -1, &nr_accounted, NULL);
vm_unacct_memory(nr_accounted);
+
+ /*
+ * For KSM to handle OOM without deadlock when it's breaking COW in a
+ * likely victim of the OOM killer, we must serialize with ksm_exit()
+ * after freeing mm's pages but before freeing its page tables.
+ */
+ ksm_exit(mm, &tlb, end);
+
free_pgtables(tlb, vma, FIRST_USER_ADDRESS, 0);
tlb_finish_mmu(tlb, 0, end);