percpu, module: implement and use is_kernel/module_percpu_address()

[safe/jmp/linux-2.6] / include / linux / err.h

diff --git a/include/linux/err.h b/include/linux/err.h
index ec87f31..1b12642 100644 (file)
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -34,6 +34,11 @@ static inline long IS_ERR(const void *ptr)
        return IS_ERR_VALUE((unsigned long)ptr);
 }
 
+static inline long IS_ERR_OR_NULL(const void *ptr)
+{
+       return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+}
+
 /**
  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
  * @ptr: The pointer to cast.