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-rw-r--r--mm/memory.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index f01b7eed6e16..0a2010a9518c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3075,3 +3075,18 @@ void print_vma_addr(char *prefix, unsigned long ip)
}
up_read(&current->mm->mmap_sem);
}
+
+#ifdef CONFIG_PROVE_LOCKING
+void might_fault(void)
+{
+ might_sleep();
+ /*
+ * it would be nicer only to annotate paths which are not under
+ * pagefault_disable, however that requires a larger audit and
+ * providing helpers like get_user_atomic.
+ */
+ if (!in_atomic() && current->mm)
+ might_lock_read(&current->mm->mmap_sem);
+}
+EXPORT_SYMBOL(might_fault);
+#endif