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-rw-r--r--arch/um/kernel/trap_kern.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c
index 95c8f8733ba..0d4c10a7360 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);