1 files changed, 9 insertions, 0 deletions

diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c
index 95c8f8733baf..0d4c10a73607 100644
--- a/arch/um/kernel/trap_kern.c
+++ b/arch/um/kernel/trap_kern.c
@@ -95,7 +95,16 @@ survive:
                 pte = pte_offset_kernel(pmd, address);
         } while(!pte_present(*pte));
         err = 0;
+        /* The below warning was added in place of
+         *      pte_mkyoung(); if (is_write) pte_mkdirty();
+         * If it's triggered, we'd see normally a hang here (a clean pte is
+         * marked read-only to emulate the dirty bit).
+         * However, the generic code can mark a PTE writable but clean on a
+         * concurrent read fault, triggering this harmlessly. So comment it out.
+         */
+#if 0
         WARN_ON(!pte_young(*pte) || (is_write && !pte_dirty(*pte)));
+#endif
         flush_tlb_page(vma, address);
 out:
         up_read(&mm->mmap_sem);