I find that the developers often just specified the numeric value
when calling a macro which is defined with a parameter for access permission.
As we know, these numeric value for access permission have had the 
corresponding macro,
and that using macro can improve the robustness and readability of the code,
thus, I suggest replacing the numeric parameter with the macro.

Signed-off-by: Chuansheng Liu <[email protected]>
Signed-off-by: Baole Ni <[email protected]>
---
 drivers/xen/gntdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 6793957..8cb7759 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -51,7 +51,7 @@ MODULE_AUTHOR("Derek G. Murray <[email protected]>, "
 MODULE_DESCRIPTION("User-space granted page access driver");
 
 static int limit = 1024*1024;
-module_param(limit, int, 0644);
+module_param(limit, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 MODULE_PARM_DESC(limit, "Maximum number of grants that may be mapped by "
                "the gntdev device");
 
-- 
2.9.2

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